In one hour,a boat goes 16 km along the stream and 6 km against the stream.The speed of the boat in still water (in km/hr) is :	Choose the correct choice from the following choices: A) 3 B) 11 C) 8 D) 9 E) 10

Rationale: "solution speed in still water = 1 / 2 ( 16 + 6 ) kmph . = 11 kmph . answer b"
Answer: B