A boat covers 12 km upstream in 4 hours and can cover the sa

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A boat covers 12 km upstream in 4 hours and can cover the same distance downstream in 3 hours. What is the speed (in km/hr) of the boat in still water?

[SSC CHSL 25 March 2018 Morning Shift]

A 3.5

B 3

C 2.5

D 2