If A runs at 8 km/h, what is the speed of B?

A and B run a 1 km race. A gives B a start of 50 m and still beats him by 15 seconds. If A runs at 8 km/h, what is the speed of B?
(a) 4.4 km/h
(b) 5.4 km/h
(c) 6.4 km/h
(d) 7.4 km/h

Anurag Mishra Professor Asked on 12th January 2016 in Maths.
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    Answer: (d) 7.4 km/h 

    Anurag Mishra Professor Answered on 12th January 2016.
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