A car covers four successive three km stretches at speeds of 10 km/hr,20 km/hr 30 km/hr and 60 km/hr respectively. Its average speed over this distance :
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avg speed = 20kmperhr
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Answer:
20 Km/hr
Explanation:
4 successive 3 km=4*3=12 km in total
Given :
time=distance/speed
so,
3/10 + 3/20 + 3/30 +3/60
->(18+9+6+3)/60
->36/60
->3/5
to find average speed,
speed=distance/time
=>speed=12/(3/5)
speed=12*5/3=4*5=20 km/hr
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