70f/sec70 \mathrm{f} / \mathrm{sec}70f/sec
80ft/sec80 \mathrm{ft} / \mathrm{sec}80ft/sec
85ft/sec85 \mathrm{ft} / \mathrm{sec}85ft/sec
90ft/sec90 \mathrm{ft} / \mathrm{sec} 90ft/sec