FIND THE DISTANCE BETWEEN A and B

PROBLEM:

Here is a road with a straight portion,up and down.A particular vehicle will travel through straight with a velocity of 63 kmph,56 kmph through up and 72 kmph through down.The car takes four hours time to travel from A to B, And takes four hour and 40 min. to travel back , that is from B to A.Then the question is what is the distance between A to B ?

IF YOU KNOW BASIC MATHEMATICS,FIND IT

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