Q. 59

A car travels 100 km at a speed of 60 km/h and returns with a speed of 40 km/h. Calculate the average speed for the whole journey.

Answer :

In the first case, car travels at a speed of 60 km/h for a distance of 100 km


In the second case, car travels at a speed of 40 km/h for a distance of 100 km



Total distance travelled = 200
Total Time Taken= t1+t2
                       
                        =


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