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A boat goes 45 km. up stream in 9 hours and a distance of 49 km. downstream in 7 hours. The speed of the boat in still water is:
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A
6 km/hr
💡 Explanation:
Upstream speed = 45/9 = 5 km/hr. Downstream speed = 49/7 = 7 km/hr. Speed in still water = (Downstream + Upstream) / 2 = (7 + 5) / 2 = 6 km/hr.