Vikas covered a certain distance by bike. If he covers 40% of the distance at 40 km/h, 50% of the distance at 25 km/h and the remaining 10% distance at 10 km/h. Find his average speed over the whole distance.
ATQ, Let the total distance be 100x Now, Average speed = (100x)/[{(100x × 40%)/40}+{(100x × 50%)/25}+{(100x × 10%)/10}] = [100x/{(40x/40)+(50x/25)+(10x/10)}] = {100x/(x+2x+x)} = (100x/4x) = 25 km/h
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