The intake pipe of a 100-gallon tank has a flow rate of 10 gallons per minute, and

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The intake pipe of a 100-gallon tank has a flow rate of 10 gallons per minute, and two drainpipes have flow rates of 5 gallons per minute each. The figure shows the volume V of fluid in the tank as a function of time t. Determine whether the input pipe and each drainpipe are open or closed in specific subintervals of the 1 hour of time shown in the graph. (There are many correct answers.)
(60, 100) 100 (10, 75) (20, 75) 75 (45, 50) 50 - (5, 50) (50, 50) 25 (30, 25) (0, 0) (40, 25) 10 20 30 40 50 60 Time (in
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