a car travels from A to B with a speed of 30km/h and then returns back to A with a speed of 50km/h. Find the average speed.
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average speed = total distance/total time taken
let the distance between A and B = x
time taken travelling from A to B = x/30
time taken travelling from B to A = x/50
total distance travelled = 2x
total time taken = x/30 + x/50
average speed = 2x/(x/30+x/50) =75/2=37.5km/h
let the distance between A and B = x
time taken travelling from A to B = x/30
time taken travelling from B to A = x/50
total distance travelled = 2x
total time taken = x/30 + x/50
average speed = 2x/(x/30+x/50) =75/2=37.5km/h
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