A boat goes 100 km downstream in 10 hours, and 75 m upstream in 15 hours. The speed of the stream is?  Answers:
A) 22 1/2  B) 22 1/8  C) 22 1/4  D) 22 2/2  E) 23 1/2
100 --- 10 DS = 10   ? ---- 1   75 ---- 15 US = 5   ? ----- 1 S = (10 - 5)/2   = 2 2 1/2 kmph 22 1/2nswer:22 1/2
<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?