## Algebra 1: Common Core (15th Edition)

We need to do a unit conversion in this problem. There are 60 seconds in a minute. Thus, we obtain: $\frac{135 seconds}{1} \times \frac{1 minute}{60 seconds} =2.25$ minutes. Note, we need to cancel out the unit of seconds, so we multiply 135 seconds by a fraction with seconds in the denominator.