Question
A train speeds past a pole in 15 seconds and a platform 100 m long in 25seconds. Its length is:
Answer: Option B
- Let the length of the train be x metres and its speed by y m/sec.
Then, x = 15 y = x . y 15
x + 100 = x 25 15
15(x + 100) = 25x
15x + 1500 = 25x
1500 = 10x
x = 150 m
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- Let the length of the train be x metres and its speed by y m/sec.
Then, x = 15 y = x . y 15
x + 100 = x 25 15
15(x + 100) = 25x
15x + 1500 = 25x
1500 = 10x
x = 150 m
Was this answer helpful ?
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