Question 547870
a boat can sail 63 km with the current and only 45 km against the current in the same time. if the boat can travel 18 km per hour in still water, what is the rate of the current?
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let x=speed of current
18+x=speed of boat with current
18-x=speed of boat against current
Travel time= distance/speed
..
63/(18+x)=45/(18-x)
63(18-x)=45(18+x)
1134-63x=810-45x
18x=324
x=18km/hr
Ans:
rate of current=18 km/hr