SOLUTION: A person sitting in a train which is travelling at 60 kmph finds that another train in the opposite direction takes 8 seconds to pass him. What is the speed of the second train if

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Question 691046: A person sitting in a train which is travelling at 60 kmph finds that another train in the opposite direction takes 8 seconds to pass him. What is the speed of the second train if it is 140 meters long?
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
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A person sitting in a train which is traveling at 60 km/h finds that another train in the opposite direction takes 8 seconds to pass him.
What is the speed of the second train if it is 140 meters long?
:
Let s = speed of 2nd train
:
the relative speed between the two trains = (s+60)
:
Convert 140 m to .140 km
8%2F3600 = time in hrs
Write a time equation, time = dist/speed
:
.140%2F%28%28s%2B60%29%29 = 8%2F3600
Cross multiply
8(s+60) = .14 * 3600
8s + 480 = 504
8s = 504 - 480
8s = 24
s = 24/8
s = 3 km/hr speed of the 2nd train