13. One day Rohit went to the market for brought a water tank for his home. Then he got a water tank for his house capacity 450 litres. He filled the tank to its brim. After one hour he noticed that the quantity of water has decreased due to a small hole in the tank. He observed the tank for next two hours and found out that quantity of water is decreasing at the rate of 9 litres every hour.
Q.1 What will be the quantity of water in the tank after 10 hours.
Q.2 After how many hours the tank would be empty?
Q.3 What kind of precautions should we have taken to save the water?
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