Answer Detail: RE: </P><P>If A driver drives a car four times a lap 10,20 30,60 kmph.What is his average speed.

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

June 06, 2005 18:05:08	#3
SmartMan	Member Since: Visitor Total Comments: N/A
RE: If A driver drives a car four times a lap 10,20 30,60 kmph.What is his average speed.
lap=x Km time for 1lap=x/10 h,2 lap=x/20 h,... all time = x/10+x/20+x/30+x/60=x/5 average speed=4x/x/5=20 kmph