5. A student wishes to measure the speed of sound in air. She plans to measure the time between making a sound and hearing the echo from a cliff.
![sun40](https://kcpe-kcse.com/wp-content/uploads/2014/09/sun40.png)
She will use the equation: speed = Distance/time
Which type of sound should she make and which distance should she use in her calculation?
![sun41](https://kcpe-kcse.com/wp-content/uploads/2014/09/sun41.png)