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Q.
A train speeds past a pole in 15 seconds and a platform 100 m long in 25 seconds. Its length is:
A.
50 m
B.
150 m
C.
200 m
D.
data inadequate
View Answer
Correct choice: B
Explanation:
Let the length of the train be x metres and its speed be y m/sec. Then, (x/y)= 15 y =(x/15) (x+100)/25 = x/15 => 15(x + 100) = 25x => 15x + 1500 = 25x => 1500 = 10x => x = 150 m.
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