Question
A and B take part in a 100 m race . A runs at 5 km per hour . A gives B a start of 8 m and still beats him by 8 seconds . The speed of B is :
Answer: Option B
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A's speed = `( 5 xx 5/18)` m/sec = `25/18` m/sec
Time taken by A to cover 100 m = `(100 xx 18/25)` sec = 72 sec.
`:.` Time taken by B to cover 95 m = ( 72 + 8) sec = 80 sec.
`:.` B's speed = `(92/80 xx 18/5)` kmph = 4.14 kmph
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