A river boat leaves Silver Town and travels upstream to Gold Town at an average speed of 6 kilometers per hour. It returns by the same route at an average speed of 9 kilometers per hour. What is the average speed for the round-trip in kilometers per hour?
A. 7
B. 7.2
C. 7.5
D. 7.8
সঠিক উত্তরঃ
B.
7.2
Explanation:
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