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The Values
Convert all to metres:
5 km = 5000 m
14 cm = 0.14 m
7 cm = 0.07 m
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Find the radius:
Radius = Diameter ÷ 2
Radius = 0.14 ÷ 2 = 0.07 m
Find the amount of water that flowed out in an hour:
Volume = πr²h
Volume = π (0.07)² (5000) = 77 m³ per hour
Find the amount of water needed in the tank:
Volume = Length x Breadth x Height
Volume = 50 x 44 x 0.07 = 154 m³
Find the number of hours needed:
Number of hours = 154 ÷ 77 = 2 hours
Answer: It takes 2 hours to fill up the tank to rise by 7 cm
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