Question 77
Two trains, 330 and 110 m long, are going in the same direction. The faster train takes one minute to pass the other completely. If they are moving in opposite directions, they pass each other completely in 3 s. What is the speed of the faster train?
Solution
Using the concept of relative velocity:
Total distance-240 m
When going in same direction
240/x-y=60
x-y=4
When going in different direction
240/x+y=3
x+y=80
On solving the equations we get,
x=42 and y=38
Speed of faster train is 42m/s
and slower one is 38m/s.
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