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A 180 m long train running at 20 m/s wil...

A 180 m long train running at 20 m/s will take what time ( in seconds ) to cross a child walking at 10 m/s in the same direction ?
20 m/sec की गति से चल रही 180 m लम्बी एक रेलगाड़ी 10 m/sec की गति से उसी दिशा में चल रहे एक बच्चे को पार करने में कितना समय (sec में) लेगी ?

A

12

B

36

C

15

D

18

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