Mark-8 .(any 2) 1) A boat travels 16km upstream and 24km downstream in 6hrs. The same boat travel36km Upstream and 48km downstream in 13hrs. Find the speed of water current and speed of boat in still wait.
Answers
Answer:
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. A swimming pool is 15m in length, 10m in breath and 4m in depth. Find the cost of cementing it at Rs.45 per m2.
Step-by-step explanation:
Let the speed of the boat in still water be x km/hr and the speed of water current be y km/hr. speed of boat in downstream = (x + y) km/hr and that in upstream = (x - y) km/hr. Now distance = speed x time Time = distance/speed Time taken by the boat to travel 16 km upstream = 16/(x-y) hours and it takes 24/(x+y) hours to travel 24 km downstream. from first condition - Solving equations (III) and (IV) m = 1/4, n = 1/12 Repalcing m, n by their original values we get x - y = 4 . . . (V) x + y = 12 . . . (VI) Solving equations (V), (VI) we get x = 8, y = 4 speed of the boat in still water is 8 km/hr. and speed of water current is 4 km/hr.
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