Speeds of a boat along the current and against the current a

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Speeds of a boat along the current and against the current are 14 km/hr and 7 km/hr respectively. What is the speed of boat (in km/hr) in still water?

[SSC MTS 21 September 2017 Shift 3]

A 3.5

B 7.5,

C 10.5,

D 9.5,