A 280 metre long train moving with an average speed of 108 km hr crosses a platform in 12 seconds A ...........

Quantitative Aptitude ( CCS) Problems on trains

A 280 metre long train moving with an average speed of 108 km/hr crosses a platform in 12 seconds. A man crosses the same platform in 10 seconds. What is the speed of the man in metre/second ?

5 m/s

8 m/s

12 m/s

None of these

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Explanation:

Speed of train = 108 kmph
= (108 × 5)/18 = 30 m/second
If the length of platform be x meter, then
x + 280/12 = 30
= x + 280 = 30 × 12 = 360
=x = 360 – 280 = 80 meter
∴ Man’s speed = Distance/ Time
=80/10 = 8 m/second