Kenneth S. answered 03/22/18
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Expert Help in Algebra/Trig/(Pre)calculus to Guarantee Success in 2018
EVERYONE should be familiar with DISTANCE = RATE(TIME), THE BASIC EQUATION FOR UNIFORM MOTION.
It appears that you know rate, 70 mph, and distance, 300 miles.
Substitute those in and solve for time, which will be in hours.
Convert to hours and minutes (if it's not an integer # of hours).