A man can row three quarters of a kilometre against the

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A man can row three quarters of a kilometre against the stream in 11¹/ ₄ minutes and return in 7¹/ ₂ minutes. The speed of the man in still water is ?

1. 2 km/hr
2. 3 km/hr
3. 4 km/hr
4. 5 km/hr

Correct Option: D

Speed upstream = (3/4) x (4/45 x 60 km/hr = 4 km/hr
Speed upstream = (3/4) x (2/15) x 60 km/hr = 6 km/hr
∴ Speed in still water = (4 + 6)/2 km/hr = 5 km/hr