Problema Solution
a freight train leaves boston at a speed of 60 km/h. two hours later, an amtrak train leaves Boston on a parallel track headed in the same direction at 90 km/h. How many hours will it take for the amtrak to catch up to the freight train?
Answer provided by our tutors
Let
v1 = 60 km/h the speed of the freight train
v2 = 90 km/h the speed of the Amtrak train
t = the time of the Amtrak train
t + 2 = the time of the freight train
Since distance = speed*time we can write:
v1*(t + 2) = v2*t
60(t + 2) = 90t
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click here to see the equation solved for t
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t = 4 hr
The Amtrak needs 4 hours to catch up to the freight train.