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

20kmph

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mari

  • Jul 24th, 2007
 

Let x be the distance and
y be the average speed
x/10+x/20+x/30+x/40=4x/y
24x/120=4x/y
y=120/6
y=20kmph

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