a car travel with a speed of 50 km/hr for first two hour 80km/hr in next two hour and 40 km/h in last one hr , find the average speed
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Answer:
60 Km/hr
Explanation:
Let the each half of the running time be t.
During first half time, speed of car is 80 km/h
Distance covered d
1
=80t km
During second half time, speed of car is 40 km/h
Distance covered d
2
=40t km
Total distance covered d=d
1
+d
2 =80t+40t=120t
Total time taken T=2t
Average speed v
avg= T/d
= 2t
120t
=60 km/hr
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