In one hour, a boat goes 14 km/hr along the stream and 8 km/hr against the stream. The speed of the boat in still water (in km/hr) is:
Choose the most appropriate option.
A) 12 km/hr	B) 11 km/hr	C) 10 km/hr	D) 8 km/hr	E) 15 km/hr
EXPLANATION   Let speed of the boat in still water = a and speed of the stream = b   Then   a + b = 14   a - b = 8   Adding these two equations, we get 2a = 22   =&gt; a = 11   ie, speed of boat in still water = 11 km/hr   ANSWER IS 11 km/hr
<result>B</result>
In one hour, a boat goes 14 km/hr along the stream and 8 km/hr against the stream. The speed of the boat in still water (in km/hr) is: