An ice cream truck that plays loud music is circling Bulan's neighborhood. $C(t)$ models the volume of the music (in $\text{dB}$) that Bulan hears, $t$ minutes after the truck arrives in her neighborhood. Here, $t$ is entered in radians. >$C(t) = -15\cos\left(\dfrac{2\pi}{15}t\right) + 65$ **How many minutes after the truck arrives does the volume first reach $75\text{ dB}$?** *Round your final answer to the nearest tenth of a minute.* [[☃ numeric-input 1]] minutes