Arthur D. answered 03/16/17
Tutor
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Forty Year Educator: Classroom, Summer School, Substitute, Tutor
distance=rate*time
he lost 1 hour in traveling time (30+15+15)
8:00 AM to 2:15 PM is 6 hours and 15 minutes minus 1 hour equals 5 hours 15 minutes
5 hours 15 minutes is 5 1/4 hours
d-r*t
320=r*(5.25)
r=320/5.25
r=60.95238 miles per hour
r≈61 mph