Answers

2016-02-24T00:19:06+05:30
Volume of cylindrical tank
= πr²h = 22/7×(3/2)²×3.5 = 24.75 m³ or 24750 litres (∵ 1m³=1000 litres)
Volume of half of the hank (Volume to be emptied) 
= 24750/2 =  litres
Time needed to empty half the tank =  12375/225 = 55 minutes   Ans.
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