Mathematics

Problem

A pump moves water at a rate of

r(t)

gallons per minute, where

t

is measured in minutes. What are the units of the definite integral

\displaystyle \int_{2}^{6} r(t)\,dt

? a)

(\text{gallons})(\text{minutes})

\text{gallons per minute}

\text{gallons}

\text{minutes per gallon}