The current of a stream at 1 kmph. A motor boat goes 35 km upstream and back to the starting point in 12 hours. The speed of the motor boat in still water is ?	Pick:  A) 8 kmph  B) 6 kmph  C) 7.5 kmph  D) 5.5 kmph  E) 6.5 kmph
Explanation:   Speed of the stream = 1   Motor boat speed in still water be = x kmph   Down Stream = x + 1 kmph   Up Stream = x - 1 kmph   [35/(x + 1)] + [35/(x - 1)] = 12   x = 6 kmph   ANSWER IS 6 kmph
<result>B</result>
The current of a stream at 1 kmph. A motor boat goes 35 km upstream and back to the starting point in 12 hours. The speed of the motor boat in still water is ?