For travelling a distance of 160 km a train travels at a speed of 80 km for 120 km and the rest at 40 km per hour find the average speed of the train(a)60(b)68(c)64(d)72

For travelling a distance of 160 km a train travels at a speed of 80 k

1.	For travelling a distance of 160 km a train travels at a speed of 80 km for 120 km and the rest at 40 km per hour find the average speed of the train(a)60(b)68(c)64(d)72
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