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A car travels first 450 kms of a journey at a speed of 90kmph and the remaining 750 km at a speed of 50kmph. find the average speed of the whole journey |
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Answer» TIME taken for 450 km at a speed of 90 kmph = 450/90 = 5 h Tike taken for 750 km at a speed of 50 kmph = 750/50 = 15 h Total distance = 450 + 750 = 1200 km total time = 5 + 15 = 20 h so, average speed = total distance/total time = 1200/20 = 60 kmph |
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