A boat goes 100 km downstream in 10 hours, and 75 m upstream in 15 hours. The speed of the stream is?
Select the correct option.
A) 22 1/9 kmph B) 27 1/2 kmph C) 42 1/2 kmph D) 22 1/2 kmph E) 22 5/2 kmph
100 --- 10 22 1/2 kmphS = 10   ? ---- 1   75 ---- 15 US = 5   ? ----- 1 S = (10 - 5)/2   = 22 ½ kmph   Answer: 22 1/2 kmph
<result>D</result>
A boat goes 100 km downstream in 10 hours, and 75 m upstream in 15 hours. The speed of the stream is?