1. A boat covers 143 km upstream in 13 hours and the same distance downstream in 11 hours. What is the speed (in km/hr) of the boat in still water?
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By: anil on 05 May 2019 02.04 am
LetĀ speed of the boat in still water = $$x$$ km/hr and speed of current = $$y$$ km/hr According to ques, => $$x-y=frac{143}{13}=11$$ -------------(i) and $$x+y=frac{143}{11}=13$$ -----------(ii) Adding both equations, we getĀ : $$2x=11+13=24$$ => $$x=frac{24}{2}=12$$ km/hr => Ans - (B)
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