A car is moving on a straight road covers one third of the distance with the speed of 20km/hr and rest with speed of 60km/hr.The average speed is
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Solution :-
Let the Total Distance be 3x.
Time taken to cover one - third of the distance = x / 20
Time taken to cover two - thirds of the distance = 2x / 60
= x / 30
Total time taken by the car
= x / 20 + x / 30
= x × 3 + x × 2 / 60
= 3x + 2x / 60
= 5x / 60
= x / 12
Average speed obtained
= (Total distance travelled) / (Total time taken)
= 3x / x/12
= 3x × 12 / x
= 3 × 12
= 36 km / h
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