SOLUTION: Galloping at 15m/s instead of 20m/s, George the jockey takes 35 seconds longer to finish his race. How long was the racecourse, in kilometers?

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Question 1151093: Galloping at 15m/s instead of 20m/s, George the jockey takes 35 seconds longer to finish his race. How long was the racecourse, in kilometers?
Answer by ikleyn(52884) About Me  (Show Source):
You can put this solution on YOUR website!
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Let "d" be the race course length.


Write the time equation


    d%2F15 - d%2F20 = 35  seconds.


Notice that all and each terms of the equations are times.


To solve the equation, multiply it by 60 (both sides). You will get


    4d - 3d = 60*35

     d      = 2100.


ANSWER.  The race course is 2100 meters long.

Solved.