Water flows at 9 km/h through a pipe with a cross-sectional area of 0.05 square metres into a rectangular tank 20 m long and 15 m wide. By how many centimetres will the water level rise in 40 minutes?
Correct answer C. 100 cm
Explanation
Flow per hour = 0.05 × 9000 = 450 m³, so 40 minutes give 300 m³. Rise = 300 / (20 × 15) = 1 m = 100 cm.
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