Problema Solution
In a 5.00km race, one runner runs at a steady 11.9km/h and another runs at 14.1km/h .How long does the faster runner have to wait at the finish line to see the slower runner cross?
Answer provided by our tutors
since speed = distance/time => time = distance/speed
the first runner will finish the race in 5/11.9 hours
the second runner will finish the race in 5/14.9 hours
we need to find the difference in times that is
(5/14.9 - 5/11.9) hours = (5/14.9 - 5/11.9)*60 min = (5/14.9 - 5/11.9)*60*60 s = 304.55 s = 5 min 4.55 s
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the faster runner will have to wait 5 min 4.55 s for the slower runner to cross the finish line.