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A boat covers a distance of 30 km in 2fr...

A boat covers a distance of 30 km in `2frac(1)(2)`h running downstream. While returning, it covers the same distance in `3frac(3)(4)` h. What is the speed of the boat in still water?
(A) 8 km/h (B) 12 km/h (C ) 14 km/h (D) 10 km?h

A

D

B

A

C

B

D

C

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