A boat goes 100 km downstream in 10 hours, and 75 m upstream in 15 hours. The speed of the stream is? Options.
A) 27 1/2 kmph B) 22 1/2 kmph C) 32 1/2 kmph D) 22 1/1 kmph E) 22 5/2 kmph
100 --- 10 DS = 10   ? ---- 1   75 ---- 15 US = 5   ? ----- 1 S = (10 - 5)/2   = 22 1/2 kmph   Answer: 22 1/2 kmph
<result>B</result>
A boat goes 100 km downstream in 10 hours, and 75 m upstream in 15 hours. The speed of the stream is?