Please see the graph. about 68.5 mph
Work Step by Step
$t = 240/r + .5$ $4 = 240/r + .5$ $3.5 = 240/r$ $3.5r = 240$ $r = 240/3.5$ $r= 68.57$
You can help us out by revising, improving and updating this answer.Update this answer
After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.