A car moves with the speed 30 km/h for 1/2 half an hour , 25 km/h for one hour and 40 km/h for 2hr . Calculate average speed the car.
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speed =30 km/h
time= 1/2
distance(d1) = speed x time
= 30 x 1/2
= 15 km
distance (d2)= speed x time
= 25 x1
= 25 km
distance( d3) = speed x time
= 40 x 2
= 80 km
NOW,
total distance = d1+d2+d3
= 15 + 25 +80
= 120 km
Total time = 1/2 + 1+ 2
= 7/2
average speed. =
total distance/total time
average speed= 120 /7/2
= 240 / 7
= 34 . 28 km/h
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