A boat travels 72 km downstream in 8 hours and 84 km upstream in 12 hours. Find the speed of the boat in still water and the speed of the water current ?
A) 9 and 3 kmph
B) 6 and 7 kmph
C) 8 and 1 kmph
D) 7 and 2 kmph
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the answer is option D
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