Question
A train, 'A,' which is 180 meters long, takes 14 seconds to
cross a 100-meter-long bridge. If the lengths of trains 'A' and 'B' are in a ratio of 6:5, and train 'B' travels at a speed that is 25% faster than train 'A,' how much time will train 'B' take to cross the same bridge?Solution
Let the speed of 'A' be 'x' m/sec.
ATQ,
{(180 + 100) /x} = 14
(280/x) = 14
So, 'x' = 20
So, speed of 'B' = 20 X 1.25 = 25 m/sec
Length of train 'B' = 180 X (5/6) = 150 metres
Required time = (150 + 100) /25 = 10 seconds
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