if in one hour, a canoe rows at 16 km/hr downstream and 9 km/hr upstream, Calculate the speed of a boat in still water (in km/hr). Choose the correct choice from the following answers
A) 18 kmph  B) 15.5 kmph  C) 12.5 kmph  D) 13.5 kmph  E) 22.5 kmph

Rationale: speed in still water = ( 16 + 9 ) 1 / 2 kmph = 12.5 kmph . answer : c
Answer: C