A boat can cover 40 km upstream and 60 km downstream in 13 hour. Also it can cover 50 km upstream and 72 km downstream in 16 hour. Find the speed of boat in still water.
Let upstream speed = a And downstream speed = b Now, => 40/a + 60/b = 13 ------- (i) And, => 50/a + 72/b = 16 ------- (ii) Solving (i) and (ii) we get, => a = 12 and b = 5 Speed of boat in still water = (a + b)/2 = (12 + 5)/2 = 8.5 kmph
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