1) A man can row upstream at 7 kmph and downstream at 10 kmph. Find man's rate in still water and the rate of current. A) 1 km/hr B) 1.5 km/hr C) 2 km/hr D) 8 km/hr E) 6 km/hr Answer: Option BExplanation:Rate in still water $=\frac{1}{2} (10+ 7)$ km/hr $=8.5$ km/hr. Rate of current $=\left(\frac{1}{2}(10-7)\right)$ km/hr = 1.5 km/hr.
