*Answer*.---"24 miles: half past 6."

*Solution*.---A level mile takes of an hour, up hill , down hill . Hence to go and return over the same mile, whether on the level or on the hill-side, takes an hour. Hence in 6 hours they went 12 miles out and 12 back. If the 12 miles had been nearly all level, they would have taken a little over 3 hours; if nearly all up hill, a little under 4. Hence 3 hours must be within an hour of the time taken in reaching the peak; thus, as they started at 3, they got there within an hour of past 6.

Twenty-seven answers have come in. Of these, 9 are right, 16 partially right, and 2 wrong. The 16 give the *distance* correctly, but they have failed to grasp the fact that the top of the hill might have been reached at *any* moment between 6 o'clock and 7.

The two wrong answers are from GERTY VERNON and A NIHILIST. The former makes the distance "23 miles," while her revolutionary companion puts it at "27." GERTY VERNON says "they had to go 4 miles along the plain, and got to the foot of the hill at 4 o'clock." They *might* have done so, I grant; but you have no ground saying they *did* so. "It was 7 miles to the top of the hill, and they reached that at before 7 o'clock." Here you go wrong in your arithmetic, and I must, however reluctantly, bid you farewell. 7 miles, at 3 miles an hour, would *not* require 2 hours. A NIHILIST says "Let `x` denote the whole number of miles; `y` the number of hours to hill-top; 3`y` = number of miles to hill-top, and `x` - 3`y` = number of miles on the other side." You bewilder me. The other side of *what?* "Of the hill," you say. But then, how did they get home again? However, to accommodate your views we will build a new hostelry at the foot of the hill on the opposite side, and also assume (what I grant you is *possible*, though it is not *necessarily* true) that there was no level road at all. Even then you go wrong. You say

" | (i) ; | |

(ii)." |

The sixteen, who are partially right, are AGNES AILEY, F.K., FIFEE, G.E.B., H.P., KIT, M.E.T., MYSIE, A MOTHER'S SON, NAIRAM, A REDRUTHIAN, A SOCIALIST, SPEAR MAIDEN, T.B.C., VIS INERTIAE, and YAK. Of these, F.K., FIFEE, T.B.C., and VIS INERTIAE do not attempt the second part at all. F.K. and H.P. give no working. The rest make particular assumptions, such as that there was no level road---that there were 6 miles of level road---and so on, all leading to *particular* times being fixed for reaching the hill-top. The most curious assumption is that of AGNES AILEY, who says "Let `x` = number of hours occupied in ascent; then `x`/2 = hours occupied in descent; and 4`x`/3 = hours occupied on the level." I suppose you were thinking of the relative *rates*, up hill and on the level; which we might express by saying that, if they went `x` miles up hill in a certain time, they would go 4`x`/3 miles on the level *in the same time.* You have, in fact, assumed that they took *the same time* on the level that they took in ascending the hill. FIFEE assumes that, when the aged knight said they gone "four miles in the hour" on the level, he meant that four miles was the *distance* gone, not merely the rate. This would have been---if FIFEE will excuse the slang expression---a "sell," ill-suited to the dignity of the hero.

And now "descend, ye classic Nine!" who have solved the whole problem, and let me sing your praises. Yours names are BLITHE, E.W., L.B., A MARLBOROUGH BOY, O.V.L., PUTNEY WALKER, ROSE, SEA BREEZE, SIMPLE SUSAN, and MONEY SPINNER. (These last two I count as one, as they send a joint answer.) ROSE and SIMPLE SUSAN and CO., do not actually state that the hill-top was reached some time between 6 and 7, but as they have clearly grasped the fact that a mile, ascended and descended, took the same time as two level miles, I mark them as "right." A MARLBOROUGH BOY and PUTNEY WALKER deserve honourable mention for their algebraical solutions being the only two who have perceived that the question leads to *an indeterminate equation.* E.W. brings a charge of untruthfulness against the aged knight---a serious charge, for he was the very pink of chivalry! She says "According to the data given, the time at the summit affords no clue to the total distance. It does not enable us to state precisely to an inch how much level and how much hill there was on the road." "Fair damsel," the aged knight replies, "---if, as I surmise, thy initials denote Early Womanhood---bethink thee that the word `enable' is thine, not mine. I did but ask the time of reaching the hill-top as my *condition* for further parley. If *now* thou wilt not grant that I am a truth-loving man, then I will affirm that those same initials denote Envenomed Wickedness!"

A MARLBOROUGH BOY. | PUTNEY WALKER. |

BLITHE. | ROSE. | |

E.W. | SEA BREEZE. | |

L.B. | SIMPLE SUSAN. | |

O.V.L. | MONEY SPINNER. |

BLITHE has made so ingenious an addition to the problem, and SIMPLE SUSAN and CO. have solved it in such tuneful verse, that I record both their answers in full. I have altered a word or two in BLITHE's---which I trust she will excuse; it did not seem quite clear as it stood.

"Yet stay," said the youth, as a gleam of inspiration lighted up the relaxing muscles of his quiescent features. "Stay. Methinks it matters little *when* we reached thats summit, the crown of our toil. For in the space of time wherein we clambered up one mile and bounded down the same on our return, we could have trudged the *twain* on the level. We have plodded, then, four-and-twenty miles in these six mortal hours; for never a moment did we stop for catching of fleeting breath or for gazing on the scene around!"

"Very good," said the old man. "Twelve miles out and twelve miles in. And we reached the top between six and seven of the clock. Now mark me! For every five minutes that fled since six of the clock when we stood on yonder peak, so many miles had we toiled upwards on the dreary mountainside!"

The youth moaned and rushed into the hostel.

BLITHE.

The elder and the younger knight,SIMPLE SUSAN.

They sallied forth at three;

How far they went on level ground

It matters not to me;

What time they reached the foot of hill,

When they began to mount,

Are problems which I hold to be,

Of very small account.The moment that each waved his hat

Upon the topmost peak---

To trivial query such as this

No answer will I seek.

Yet can I tell the distance well

They must have travelled o'er:

On hill and plain, 'twixt three and nine,

The miles were twenty-four.Four miles an hour their steady pace

Along the level track,

Three when the climbed---but six when they

Came swiftly striding back

Adown the hill; and little skill

It needs, methinks, to show,

Up hill and down together told,

Four miles an hour they go.For whether long or short the time

Upon the hill they spent,

Two thirds were passed in going up,

One third in the descent.

Two thirds at three, one third at six,

If rightly reckoned o'er,

Will make one whole at four---the tale

Is tangled now no more.

MONEY SPINNER.

NEXT | Title | Epigraph | Preface | Contents |

Knot | I II III IV V VI VII VIII IX X |

Answers | I II III IV V VI VII VIII IX X |

Stefan Bilaniuk, Department of Mathematics, Trent University

Maintained by Stefan Bilaniuk. Last updated 1998.08.22.