A car travels on a straight road from point A to point B in four hours, and then from point B back to point A in six hours. The distance between the two points is 240km. What is the car's average speed?
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Total distance traveled by car D=240+240=480 km
Total time taken t=4+6=10 h
∴ Average speed of car =Dt=48010=48km/h
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