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 2 ½ kmph
B) 6 2 ½ kmph
C) 5 2 ½ kmph
D) 2 8 ½ kmph
E) 6 5 ½ kmph
100 --- 10 DS = 10   ? ---- 1   75 ---- 15 US = 5   ? ----- 1 S = (10 - 5)/2   = 2 2 ½ kmph   2 2 ½ kmphnswer:2 2 ½ kmph
<result>A</result>
A boat goes 100 km downstream in 10 hours, and 75 m upstream in 15 hours. The speed of the stream is?