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1. A car during its journey travels 30 minutes at the speed of 40 km/hr.Another 45 minutes at the speed of 60 km/hr and for two hours at a speed of 70 km/hr.Find the average speed of the car?
(A): 53 km/hr
(B): 63 km/hr
(C): 70 km/hr
(D): None of these
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