His speed of 65 MPH (miles per hour) means that in each hour, he will drive 65 miles. He drives for 2 hours. 2x65.
So, I will let you figure out how many miles he would drive in two hours.
100 miles
36 mph
Distance = Rate * Time or, for our purposes Time = Distance/Rate Time = 550 miles/65 mph ( as you see miles cancels and leaves hours ) Time = 8.5 hours spent driving
180 miles, 5 hours; 36 mph
He drove 180 miles in 5 hours for an average speed of 36 miles per hour.
36 mph
180 miles / 5 hours = 36 miles per hour (average)
36 miles per hour
That trip would be 1,100 miles, which could be driven in 16 1/2 hours if you didn't make any stops.
Six more hours.
5.24 hours.
(80 + 100) / (2 + 3) = 180/5 = 36 miles per hour.