a car is moving on a straight road covers one third of the distance with speed of 20 kilometre per hour and rest with a speed of 60 km per hour the average speed of the car is
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Answer: 36 km/h
Explanation:
Let Total distance travelled by X.
Distance covered with speed 20 km/h
= X/3
Distance covered with speed 60 km/h
= X-X/3=2X/3
Let T1 and t2 be the time taken to cover the distance x.
T1 = X/3/20 = X/60
T2 = 2X/3/60 = X/90
Speed(avg) = X/X/90 + X/60
= X/X/36
= 36 km/h
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