A boat goes 100 km downstream in 8 hours, and 75 Km upstream in 15 hours. The speed of the stream is?  Choose the correct choice from the following answers.
A) 3 B) 6.5 C) 5.5 D) 4 E) 3.75
100 --- 10 DS = 12.5   ? ---- 1   75 ---- 15 US = 5   ? ----- 1 S = (12.5 - 5)/2= 
<gadget id="calculator">(12.5 - 5)/2</gadget>
<output>3.75</output>
3.75 kmph.Answer:3.75
<result>E</result>
A boat goes 100 km downstream in 8 hours, and 75 Km upstream in 15 hours. The speed of the stream is?