Question
A man swims 3km/h against the stream and goes 1 km in 10
minutes along the stream, how much time will it take to cover 5 km in still water?Solution
Let the speed of boat in still water =B and speed of stream =S then – ATQ- B-S= 3km/h    … (1) B+S=1/10 km/minutes B+S=6 km/h Solving (1) +(2) 2B=3+6=9 B=9/2=4.5km/h Take the time cover 5 km in still water = 5/4.5 =10/9 h.
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