Question

a car is moving on a straight road covers one third of the distance with a speed of 20 km per hour and the rest with the speed of 60 km per hour the average speed of the card is​

Answer 1

Answer:36km/hr

Explanation:

Let the total distance be x

Average speed=x/total time

Time =distance /speed

Time taken to cover 1/3 of the distance=x/3/20=x/60

Time taken to cover 2/3 (remaining)of the distance=2x/3/60=2x/180=x/90

Average speed =x/(x/60+x/90)=x/5x/180=x*(180/5x)=36 km/hr

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Answer 2

Refer to the attachment