A boat goes 100 km downstream in 10 hours, and 75 m upstream in 15 hours. The speed of the stream is?	Options.
A) 22 1/2 B) 22 18/2 C) 28 1/2 D) 22 1/5 E) 22 1/4
100 --- 10 DS = 10   ? ---- 1   75 ---- 15 US = 5   ? ----- 1 S = (10 - 5)/2   = 22 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?