A train speeds past a pole in 15 seconds and speeds past a platform 100 meters long in 25 second. Its length in meters is?

200
150
50
Data inadequate

Correct Answer: 150

Explanation:

Let the length of the train be 'L' meters and its speed be 'v' meters/sec
Then, L/v = 15
⇒ v = L/15 ....(1)
Now, (L + 100)/25 = L/15
⇒ L = 150 m

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