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a car moves with a speed of 60 km h to the power of -3 for 20 min and then at a speed of 30
a car moves with a speed of 60 km h to the power of -3 for 20 min and then at a speed of 30 km h to the power -1 for the next 20 min . the total distance covered by the car is _ _ _ _ _ _ km
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