Calculate the speed of a boat in still water (in km/hr) if in one hour, the boat goes 15 km/hr downstream and 7 km/hr upstream. Choose the correct choice from the following: A) 12 kmph B) 13 kmph C) 14 kmph D) 15 kmph E) 11 kmph
Speed in still water = (15 + 7)1/2 kmph = 11 kmph.   answer :11 kmph
<result>E</result>
Calculate the speed of a boat in still water (in km/hr) if in one hour, the boat goes 15 km/hr downstream and 7 km/hr upstream.