Mathematics, 19.06.2020 22:57 bhhh7351

a car travels at 54 km/h for first 20seconds , 36km/h for next 30seconds and finally 18km/h for next 10 seconds find the averade velocity

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a car travels at 54 km/h for first 20seconds , 36km/h for next 30seconds and finally 18km/h for next...