Quantitative Aptitude :: Problems on Trains - Discussion
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Choose the correct option.
A train traveling at 72 kmph crosses a platform in 30 seconds and a man standing on the platform in 18 seconds. What is the length of the platform in meters?
A300 meters.
B550 meters.
C340 meters.
D240 meters.
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STEP-BY-STEP
72 kmph = 20 meters/second
length of the train = 20*18= 360 meters
length of the train + length of the platform = 20*30 = 600 meters
So, length of the platform = 600-360 = 240 meters
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TRICK
speed in m/s = 72x(5/18) = 20m/s
length of the train = 30 x 20 = 600m
length of the platform = (x + 600)/18 = 240
length of the platform = x + 600 =360
= 240
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STEP-BY-STEP
72kmph= 20m/sec
Length of the train can be found by taking the time in which the train crosses the man= 20* 18=360m
Let length of platform be x
So 20*30= (360+x)
Solving we get x= 240m
Length of the train can be found by taking the time in which the train crosses the man= 20* 18=360m
Let length of platform be x
So 20*30= (360+x)
Solving we get x= 240m
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