Curtis decided to go on a road trip to Canada. On the first day of his trip, he drove for 11 hours and traveled 616 miles. At what rate did he travel on the first day, in miles per hour?

The perimeter of △cde is 55 cm. a rhombus dmfn is inscribed in this triangle so that vertices m, f, and n lie on the sides cd , ce , and de respectively. find cd and de if cf=8 cm and ef=12 cm. the answer is not cd=20 and de=15. i have tried that one, it does not work.