Problems on Trains - Arithmetic Aptitude Questions and Answers

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A train speeds past a pole in 15 seconds and a platform 100 m long in 25 seconds. Its length is:

50 m

150 m

200 m

Data inadequate

Answer : Option B

Explanation :

Let the length of the train be x metres and its speed by y m/sec.

Then, \(\frac { X } { Y } \)		= 15 y = \(\frac { X } { 15 }\)		.

\( \frac {X +100 } { 25 }\) =\(\frac { X } { 15 }\)

15(x + 100) = 25x

15x + 1500 = 25x

1500 = 10x

x = 150 m.

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