A man can row upstream at 10kmph and downstream at 24 kmph. The speed of the stream is Choose one:
A) 2.5 km/hr
B) 4.2 km/hr
C) 7 km/hr
D) 10.5 km/hr
E) None
Sol.   Speed of stream = 1/2(24 -10) kmph = 7 kmph.   Answer 7 km/hr
<result>C</result>
A man can row upstream at 10kmph and downstream at 24 kmph. The speed of the stream is