Streaming services may implement bandwidth throttling to manage network traffic

during peak and off$-$peak hours, ensuring consistent service quality. The function

$=160+46cos(0\mathrm{.}2618t)$ models the bandwidth availability $($in Mbps$)$ for a streaming

service over time, where $t$ is measured in minutes within a $24-$hour cycle. Find the

rate of change in bandwidth availability when $t=5$ hours. Write only a number as

your answer and round to one decimal place.