water is being pumped into a watertank of dimensions 10m x 7.5 x 4m at the rate of 400l per minute. what is the time taken to fill the tank completely.
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We have,length of the tank, l = 10 mbreadth of the tank, b = 7.5 mheight of the tank, h = 4 mNow, volume of tank = l × b × h = 10×7.5×4 = 300 m3Now, 1 m3 = 1000 litresSo, volume of tank = 300 m3 = 300000 litresTime taken to fill 400 litres water = 1 minSo, time needed to fill 300000 litres of water = 300000400 = 750 min = 75060 hour = 1212 hours

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