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2014-08-04T17:06:36+05:30

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V = 400 Ltr
Draining rate of pump A = 400 ltr / 15 * 24 hour = 10/9 litr/hour = 1.1111 litre / hour
Filling  Rate of pump B = (400 litre + 0.002 *60*24*50) / 50 =
       = 8 + 2.88 = 10.88 litre / day  = 10.88 / 24 = 0.4533 litre /hour

Draining rate of Pump A is higher than filling rate of pump B.
So tank cannot be filled, if both pumps are switched on continuously.

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2014-08-05T22:06:49+05:30
V = 400 Ltr
Draining rate of pump A = 400 ltr / 15 * 24 hour = 10/9 litr/hour = 1.1111 litre / hour
Filling  Rate of pump B = (400 litre + 0.002 *60*24*50) / 50 = 
       = 8 + 2.88 = 10.88 litre / day  = 10.88 / 24 = 0.4533..... litre /hour

Draining rate of Pump A is higher than filling rate of pump B. 
So tank cannot be filled, if both pumps 
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