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If A driver drives a car four times a lap 10,20 30,60 kmph.What is his average speed.
Editorial / Best Answer
Answered by: bhaskar s p
avg speed for 2 speeds is 2*x*y/(x+y)
therefore avg of 2*10*20/(10+20) and
2*30*60/(30+60) which is equal to 20
its correct 20
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