a car moves through 20 km with the speed of 40 km/h, and the next 20 km with the speed of 60 km/h. calculate average speed
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avg speed =d1 +d2/v1+v2
t1 =d1/v1 and t2=d2/v2
avg speed=20+20/(20/40+20/60)
avg speed=20(1+1)
______
20(1/40+1/60)
avg speed =2*40*60/40+60
=2*40*60/100
48km/h
t1 =d1/v1 and t2=d2/v2
avg speed=20+20/(20/40+20/60)
avg speed=20(1+1)
______
20(1/40+1/60)
avg speed =2*40*60/40+60
=2*40*60/100
48km/h
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