SOLUTION: A runner starts at the beginning of a runners’ path and runs at a
constant rate of 5 mi/hr. Six minutes later a second runner begins at the
same point running at a rate of 7
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Question 399516: A runner starts at the beginning of a runners’ path and runs at a
constant rate of 5 mi/hr. Six minutes later a second runner begins at the
same point running at a rate of 7 mi/hr and following the same course.
How long will it take the second runner to reach the first?
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
In 6 min, the 1st runner goes mi
(note that 6 min = 6/60 hr)
Now the 2 runners will run for the same amount of time
with a half-mile headstart for runner #1.
2nd runner:
(1)
1st runner:
(2)
Substitute (1) in (2):
(2)
hr
It will take the 2nd runner 15 min to catch the 1st
check answer:
and, also,
OK
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