There are 397.677563 miles in 640 kilometers. 640 kilometers x 1 mile/1.609344 kilometers = 397.677563 miles 1 mile = 1.609344 kilometers
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360 ÷ 40 = 9 hours (Note: every hour you will have travelled 40 km.)
900
Suppose you go by speed 50 km p h then you need 10 hours to cover that distance. So if, in general, v km p h is the speed then the time taken to cover 500 km will be got by 500 / v in hours.
average speed
26218.57 km/hr