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Arithmetic Ability
Problems on Trains

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Q.

An Engine length 1000 m moving at 10 m/s. A bird is flying from engine to end with 'x' m/s and coming back at '2x' m/s. Take total time of bird travelling as 187.5 s. Find x and 2x in km/hr ?

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Correct choice: C

Explanation:

Birds speeds in mtrs/sec is 'x' and '2x' . While flying from Engine to end, relative speed = (x+10) m/sec from end to engine, flying speed = (2x - 10) mtr/sec so 1000/(x+10) + 1000/(2x-10) = 187.5 secs solving it, we get so x = 8.728 m/sec and 2x= 17.456 m/sec x = 31.4208 km/hr and 2x = 62.8416 km/hr.
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