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A boat goes 32 km upstream and 36 km downstream in 7 hours. In t hours, it can go 40 km upstream and 48 km downstream. If x represents the speed of the boat in still water in km/hr and y represents the speed of the stream in km/hr, then ......(A) x + y = 12, x - y = 6(B) x + y = 5, x - y = 11(C) x + y = 6, x - y = 10(D) x + y = 10, x - y = 6 |
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Answer» A boat goes 32 km upstream and 36 km downstream in 7 hours. In t hours, it can go 40 km upstream and 48 km downstream. If x represents the speed of the boat in still water in km/hr and y represents the speed of the stream in km/hr, then x + y = 12, x - y = 6. |
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