A and B take part in 100 m race. A runs at 8 kmph. A gives B a start of 6 m and still beats him by 12 seconds. The speed of B is:
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Explanation:
Speed =
Time Travelled
Distance
⇒A's Speed =5kmph=
Time Travelled
100m
⇒Total time taken by A to complete 100m=
(5×1000/3600)
100
seconds=72 seconds
⇒B's Speed=
Time Taken byB
Distance Travelled by B
=
(7+−8)/3600
(100−8)/1000
kmph=
800
92×36
kmph=4.14 kmph
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