Answer Detail: RE: If A driver drives a car four times a lap 1...

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If A driver drives a car four times a lap 10,20 30,60 kmph.What is his average speed.

November 11, 2005 06:12:12	#10
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RE: If A driver drives a car four times a lap 1...
Avg Speed==Total Distance/Total Time One lap=x Km Time for 1 lap=x/10 h,2 lap=x/20 h,... Total time = x/10+x/20+x/30+x/60=x/5 Hence Average speed=4x/x/5=20 kmph