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 answers: A) 8 2 ½ kmph B) 2 7 ½ kmph C) 6 2 ½ kmph D) 2 2 ½ kmph E) 2 3 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?