Question

1. A circular running track is 1/4 mile long. Elena runs on this track, completing each lap in 1/20 of an hour. What is Elena's running speed, in miles per hour?

Answer 1

Answer: Elena's running speed = 5 miles per hour.

Explanation:

Length of track =
`\frac14 \text{ mile}`

Time taken to complete one lap =
`(1)/(20)` of an hour.

Elena's running speed =
`(Distance)/(Time)`

`=\frac{\frac14}{\frac1{20}}\text{ miles per hour}\\\\=(20)/(4)\text{ miles per hour}\\\\=5\text{ miles per hour}`

Hence, Elena's running speed = 5 miles per hour.