- A2 hours
- B1 hour 40 minutes
- C24 minutes
- D1 hour 20 minutes
Step-by-Step Solution
Rates per minute: fill , drain . Net : 120 minutes = 2 hours.
Answer: A) 2 hours
A school's overhead tank is filled by a motor in 40 minutes. The taps below drain it in 1 hour when all are open. If the motor is started while all the taps are running, how long does the tank take to fill?
Class 8Leaks and Changing PipesDirect and Inverse Proportions
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