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a. After 8 mins, the fraction of water in tank = 18/58 = 9/29 #

b. Water from tap D flows out at = (58 – 18) / 8 = 5 litres per minute

After tap E is turn on, speed of water flowing out = 18/12 = 1.5 litres per minute

So E must be flowing in at 5 – 1.5 = 3.5 litres per minute #

 

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