A boat goes 100 km downstream in 10 hours, and 90 m upstream in 15 hours. The speed of the stream is?
Choose the correct answer
A) 22 1/7  B) 2  C) 22 1/2  D) 22 1/1  E) 22 1/3
100 --- 10 DS = 10   ? ---- 1   90 ---- 15 US = 6   ? ----- 1 S = (10 - 6)/2= 
<gadget id="calculator">(10 - 6)/2</gadget>
<output>2</output>
2 kmp Answer: 2
<result>B</result>
A boat goes 100 km downstream in 10 hours, and 90 m upstream in 15 hours. The speed of the stream is?