A boat goes 100 km downstream in 10 hours, and 75 m upstream in 15 hours. The speed of the stream is?	Choose the most appropriate option:
A) 22 1/8 kmph
B) 24 3/2 kmph
C) 22 1/2 kmph
D) 22 1/5 kmph
E) 22 9/2 kmph
100 --- 10 DS = 10   ? ---- 1   75 ---- 15 US = 5   ? ----- 1 S = (10 - 5)/2   = 2 2 1/2 kmph   Answer:22 1/2 kmph
<result>C</result>
A boat goes 100 km downstream in 10 hours, and 75 m upstream in 15 hours. The speed of the stream is?