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At 1:05 a.m. at the scene of a fire, the gauge on a fire engine's pump control panel indicated a pressure of 260 pounds per square inch (psi). By 1:20 a.m., the same gauge indicated a pressure of 110 psi. The pressure decreased, on average, about how many psi per minute?

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At 1:05 a.m. at the scene of a fire, the gauge on a fire engine's pump control panel indicated a pressure of 260 pounds per square inch (psi). By 1:20 a.m., the same gauge indicated a pressure of 110 psi. The pressure decreased, on average, about how many psi per minute?






 
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