a car travels a distance with a speed of 20 km per hour and returns with a speed of 40 km per hour what will be the average speed of the car
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Explanation:
Let distance from A to B be x
Time for travel from A to B= x/20
Time for travel from B to A= x/30
Hence,speed for total distance 2x is:
30
x
+
20
x
2x
=
5x
2x×60
=24 km\hr
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