J.R. S. answered 12/14/17
Tutor
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Ph.D. in Biochemistry--University Professor--Chemistry Tutor
195 miles/3 hours x 7 hours = 455 miles
Look at it this way: she drove 195 miles in 3 hours so that 65 miles per hour (195/3).
At 65 miles per hour, in 7 hours she goes 7 x 65 = 455 miles.
If you want the total distance that she went, you need to add this 455 miles to the 195 miles she already went in the first 3 hours for a total of 650 miles (in the 10 hours)