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1. Distance from a place A to another place B is 200 km. A car takes 3 hours to go from A to B and 4 hours to return from B to A. What is the average speed of the car in the whole journey?
(A): 40 km./hr
(B): 50 km/hr
(C): 60 km./hr
(D): 70 km./hr
(E): 80 km./hr
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