A boat goes 100 km downstream in 10 hours, and 75 m upstream in 15 hours. The speed of the stream is?
Choose the correct choice from the following.
A) 2 8 ½ kmph	B) 8 2 ½ kmph	C) 2 9 ½ kmph	D) 2 2 ½ kmph	E) 3 2 ½ kmph
100 --- 10 2 2 ½ kmphS = 10   ? ---- 1   75 ---- 15 US = 5   ? ----- 1 S = (10 - 5)/2   = 2 2 ½ kmph   Answer: 2 2 ½ 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?