Two trains of equal lengths take 10 seconds and 15 seconds respectively to cross

Question

Two trains of equal lengths take 10 seconds and 15 seconds respectively to cross a telegraph post. If the length of each train be 120 metres, in what time (in seconds) will they cross each other travelling in opposite direction?

Options:

A . 10

B . 12

C . 15

D . 20

Answer: Option B
Answer: (b).12

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