Question

Bill runs 4 miles in 27 minutes How many minutes does he take per mile? Minutes per mile? At Cheng's Bike Rentals, it costs $10 to rent a bike for 3 hours. How many hours of bike use does a customer get per dollar? Hours per dollar?

Answer 1

First Part

`\begin{gathered} 4\text{ miles =27 minutes} \\ 1\text{ mile = x } \\ \text{Cross multiply} \end{gathered}`
`\begin{gathered} 4x=27*1 \\ x=(27*1)/(4) \\ x=(27)/(4) \\ x=6.75\text{ minutes} \end{gathered}`

Bill will take 6.75 minutes per mile.

Second Part

`\begin{gathered} 10\text{ dollars = 3 hours} \\ 1\text{ dollar = x} \\ \text{Cross multiply} \end{gathered}`
`\begin{gathered} 10x=3*1 \\ x=(3*1)/(10) \\ x=(3)/(10) \\ x=0.3 \end{gathered}`

A customer will get 0.3 hours per dollar.