Mathematics
NULL
Medium
Question
Water flows into a tank 200 m × 150 m through a rectangular pipe 1.5 m × 1.25 m at 20 km/h. In what time will the water rise by 2 m?
A
76 min
B
80min
C
90min
D
96min
✓ Official correct answer
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A
76 min
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B
80min
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C
90min
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D
96min
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Explanation
Volume needed = 200×150×2 = 60,000 m³. Flow rate = 1.5×1.25×20,000 = 37,500 m³/h. Time = 60,000/37,500 = 1.6 h = 96 min.