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A boat can move upstream at 25 kmph and downstream at 35 kmph, then the speed of the current is_________?

A boat can move upstream at 25 kmph and downstream at 35 kmph, then the speed of the current is_________?

A. 5 kmph
B. 10 kmph
C. 30 kmph
D. 15 kmph
Explanation:
US = 25
DS = 35
M = (35 – 25)/2 = 5