A certain river has a current of 4 miles per hour.A boat takes twice as long to travel upstream between two points as it does to travel downstream between the same two points . What is the speed of the boat in still water ?
A. 6 miles per hour
B. 8 miles per hour
C. 12 miles per hour
D. cannot be determined
সঠিক উত্তরঃ
C.
12 miles per hour
Explanation:
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