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Question

A car travels a certain distance at a speed of 50 km/h and returns with a speed of 40 km/hr. Calculate the average speed of the whole journey.

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Solution

To complete 1km distance with speed =50kmhr it tkes time t1=150s
To complete 1km distance with speed =40kmhr it tkes time t1=140s
Average speed=1+1(1/50)+(1/40)=44.44m/s


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