Calculate the speed of a boat in still water (in km/hr) if in one hour, the boat goes 10 km/hr downstream and 4 km/hr upstream.  Choose the correct option:
A) 7 kmph
B) 8 kmph
C) 9 kmph
D) 7 kmph
E) 6 kmph
Speed in still water = (10 + 4)1/2 kmph = 7 kmph.   answer :7 kmph
<result>A</result>
Calculate the speed of a boat in still water (in km/hr) if in one hour, the boat goes 10 km/hr downstream and 4 km/hr upstream.