A man can row downstream at 10 kmph and upstream at 5 kmph. The man's rowing rate in still water is ----

A 2.5 km/hr
B 5 km/hr
C 7.5 km/hr
D 15 km/hr

Correct Answer: 7.5 km/hr

Let the man's rowing rate and stream's flowing rate be U and V respectively. So,     U + V = 10 And,   U - V = 5 - - - - - - - - - - - - - - - - - - - - - - - U + U = 10 + 5  [By addition] or,  2U = 15 So,  U = 7.5 km/hr
Bissoy MCQ
#গণিত #Standard Bank Ltd #Standard Bank Ltd - Probationary Officer - 09.05.2008

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