a man moves on a straight path. he travels total distance l. he travels half of his journey with speed 10m per second.the remaining part of journey was covered by him with speed 20 m per second for half of remaining time and with velocity 40 m per second for other half of remaining time.the average speed is (a) 15 m per second (b)70/3 m per second (c) 60 m per second (d) 10 m per second
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