Answer:
It took him 6.75 hours
or 6 hours and 45 minutes
Step-by-step explanation:
The first two hours he travels
50 mi/h *2 h = 100 mi
then a 15 min break
then 2 more hours
50 mi/h *2 h = 100 mi
then a 30 min break
then 2 more hours
50 mi/h *2 h = 100 mi