Multiple Choice QuestionsA man rows down a river 15 km in 3 h with the stream and returns in 
The rate at which he rows in still water is
2.5 km/h
1.5 km/h
3.5 km/h
4.5 km/h
A boat goes 15 upstream and 
downstream in 3 hours 15 minutes. It goes 12 km upstream and 14 km downstream in 3 hours. What is the speed of boat in still water.
4 km/hr
6 km/hr
10 km/h
14 km/hr
C.
10 km/h
Let speed of boat with downstream = x km/hr.
speed of boat with upstream = y km/hr.
According to the question,
Solving (i) and (ii), we get
x = 14, y = 6
∴ Speed of boat in still water
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