a car travels 30 kilometre with the speed of 40 kilometre per hour and next 30 kilometre with a speed of 20 kilometre per hour calculate the total time taken by the car
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30 km with the speed of 40 km per hour
t= d/s = 30/40 = 3/4
30 km with the speed of 20 km per hour
t=d/s=30/20 = 3/2
3/4+3/2
= 9/4
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