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On level farmland, two runners leave at the same time from [#permalink]
02 Jun 2007, 16:59

00:00

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Difficulty:

35% (medium)

Question Stats:

65% (02:10) correct
34% (01:28) wrong based on 52 sessions

9. On level farmland, two runners leave at the same time from the intersection of two country roads. One runner jogs due north at a constant rate of 8 miles per hour while the second runner jogs due east at a constant rate that is 4 miles per hour faster than the first runner's rate. How far apart, to the nearest mile, will they be after 1/2 hour ?
(A) 6
(B) 7
(C) 8
(D) 12
(E) 14

Re: On level farmland, two runners leave at the same time from [#permalink]
18 Mar 2014, 22:37

1

This post received KUDOS

Expert's post

lanka1 wrote:

On level farmland, two runners leave at the same time from the intersection of two country roads. One runner jogs due north at a constant rate of 8 miles per hour while the second runner jogs due east at a constant rate that is 4 miles per hour faster than the first runner's rate. How far apart, to the nearest mile, will they be after hour ?

(A) 6 (B) 7 (C) 8 (D) 12 (E) 14

There was an error in the question posted originally. It is actually asking for the distance between two runners after 1/2 hour travel at their respective directions. I have corrected the error. Choice B is the Answer.
_________________

Let ABC is a right angle triangle, and angle ABC is 90 degree, So, first one is going through AB and achieved 4miles whereas the person on BC achieves 6 miles in half an hour,

On level farmland, two runners leave at the same time from [#permalink]
29 Apr 2010, 04:07

On level farmland, two runners leave at the same time from the intersection of two country roads. One runner jogs due north at a constant rate of 8 miles per hour while the second runner jogs due east at a constant rate that is 4 miles per hour faster than the first runner's rate. How far apart, to the nearest mile, will they be after \frac{1}{2} hour ?

(A) 6 (B) 7 (C) 8 (D) 12 (E) 14

Last edited by Narenn on 18 Mar 2014, 22:38, edited 1 time in total.

On level farmland, two runners leave at the same time from the intersection of two country roads. One runner jogs due north at a constant rate of 8 miles per hour while the second runner jogs due east at a constant rate that is 4 miles per hour faster than the first runner's rate. How far apart, to the nearest mile, will they be after hour ? (A) 6 (B) 7 (C) 8 (D) 12 (E) 14

is the question correct as none of the options seem fit??

After an hr, 1st runner and 2nd runner will reach 8m and 12m respectively from the intersection they started. Because they ran North and East, their path forms a right angle and hence distance between them would be hypotenuse, which is sqrt(8*8+12*12) = sqrt(208), which is close to 14 (sqrt of 196).