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A 270 metres long train running at the speed of 120 kmph crosses another train running in opposite direction at the speed of 80 kmph in 9 seconds. What is the length of the other train?
OOPS, your answer is incorrect
For opposite directions, Relative speed = (120 + 80) km/hr = [200 * (5/18)] m/sec = [500/9] m/sec.
Let the length of the other train be x metres.
Then, (x + 270) / 9 = 500/9
x + 270 = 500
x = 230.
A train 125 m long passes a man, running at 5 kmph in the same direction in which the train is going, in 10 seconds. The speed of the train is ?
OOPS, your answer is incorrect
From the problem, Speed of the train relative to man = [125/10] m/sec = [25/2] m/sec. = [(25/2) * (18/5)] km/hr = 45 km/hr.
Let the speed of the train be x kmph. Then, relative speed = (x - 5) kmph.
ஃx - 5 = 45 or x = 50 kmph.
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