A train passes two bridges of lengths 800 m and 400 m in 100 seconds and 60 seconds respectively the...........

Quantitative Aptitude ( CCS) Problems on trains

A train passes two bridges of lengths 800 m and 400 m in 100 seconds and 60 seconds respectively, the length of the train is

80 m

90 m

200 m

150 m

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Explanation:

Let length of the train be x m and speed of the train is s kmph.
Speed, s = (x+800)/100 ..... (i)
Speed, s = (x+400)/60 ..... (ii)
Equating equation (i) and (ii), we get,
Or, (x+800)/100 = (x+400)/60
Or, 5x+2000 = 3x+2400;
Or, 2x = 400;
Or, x = 200 m.

Hence, option 3 is the correct answer.