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Owango drove from town R to town S, a distance of 140 km, at an average speed of 70km/h. At S he rested for 1#1/2# hours and then continued to town T. Between town S and T he drove for 3#1/2# hours at an average speed of 60 km/h. What was Owango’s average speed in kilometers per hour for the whole journey?
A.65
B.70
C.50
D.60