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A person goes to certain distance at speed 4kmph. he returns on bicycle at the speed of 16kmph. find his average speed during the whole journey |
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Answer» LET the distance be X km so, time taken to go the distance with speed 4kmph = x/4 hr so, time taken to return with speed 16kmph = x / 16 hr so, total time = x/4 + x/16 = 5x/16 hr total distance = x + x = 2X so, average speed = 2x / (5x/16) = 32/5 = 6.4 kmph |
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