Question 7662
A little common sense might be useful here.

When you think of speed, you would normally think...miles per hour.

Miles (distance) per (for each) hour ( time) or {{{distance/time}}}.

So, for your problem, distance = 770 miles and time = 120 minutes or 2 hours.

{{{distance/time = 770 miles/2 hours}}} = {{{385 miles/ hour}}} = 385 miles per hour.