A car travels 180 kilometre with the speed of 60 kilometre per hour and after that another 80 km with a speed of 40 kilometre per hour .What is the average speed of the car during the whole journey....
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Answer:
average speed = total distance / total time
time = distance / speed
so total distance= 180+80=260
time = 180/60 + 80/ 40
260/ 5 = 52km/h is average speed
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