SOLUTION: Two persons are to run a race, but one can run 11 meters per second, whereas the other can run 7 meters per second. If the slower runner has a 42-meter head start, how long will it
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Question 757600: Two persons are to run a race, but one can run 11 meters per second, whereas the other can run 7 meters per second. If the slower runner has a 42-meter head start, how long will it be before the faster runner catches the slower runner, if they begin at the same time?
Answer by ankor@dixie-net.com(22740) (Show Source): You can put this solution on YOUR website!
Two persons are to run a race, but one can run 11 meters per second,
whereas the other can run 7 meters per second.
If the slower runner has a 42-meter head start, how long will it be
before the faster runner catches the slower runner, if they begin
at the same time?
:
We can us relative speed here which is 11 - 7 = 4 m/sec
How long would it take to cover 42 meters at this speed
:
= 10.5 sec
:
:
You can confirm this for yourself, find the distance traveded
10.5 * 11 = 115.5 m
10.5 * 7 = 73.5 m
--------------------
the difference: 42 m
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