During a storm, 5 cm of rain falls on a flat roof 22 m long and 20 m wide. All the water drains into a cylindrical tank of base radius 1 m. Taking π = 22/7, how high does the water rise in the tank?
Correct answer A. 7 m
Explanation
Rainwater = 22 x 20 x 0.05 = 22 cu m. Tank base area = 22/7 x 1 x 1 = 22/7 sq m. Height = 22 / (22/7) = 7 m.
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