Discussion :: Races and Games
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A and B take part in 100 m race. A runs at 5 kmph. A gives B a start of 8 m and still beats him by 8 seconds. The speed of B is:
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Answer : Option B
Explanation :
A's speed = [ 5 x \(\frac { 5 } { 18 } ]\) m/sec =\(\frac { 2 } { 18 }\) m/sec
Time taken by A to cover 100 m = [100 x \(\frac { 18 } { 25 }\)] sec = 72 sec
Time taken by B to cover 92 m = (72 + 8) = 80 sec.
B's speed = [\(\frac { 90 } { 80 }\) x \(\frac { 18 } { 25 }\)] kmph =4.14 kmph.
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