Question
A boat can travel 200 km downstream in 8 hours and 48 km
upstream in 12 hours. Find the speed of the current.Solution
Let the speed of the boat in still water be 'x' km/hr and the speed of the current be 'y' km/hr. According to the question, 
On solving equations (1) and (2), we add them to get: 2x=29βx=14.5 km/hr Then substituting back to find 'y':Β 25β14.5=y=10.5 km/hr Speed of the current = 10.5 km/hr
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