bret and cindy took different routes to travel from point a to point e. bret took the route along a, b, c, d, and e. cindy took the route along a, f, and e and reached the destination in 2 hours. their routes are shown.
if bret's average speed was twice cindy's average speed, what was bret's average speed?
3 miles per hour
6 miles per hour
8 miles per hour
9 miles per hour