Ashley drove 315 miles in 5 hours. At the same rate, how long would it take her to drive 819 miles?

13 hours

Step-by-step explanation:

divide 315 miles by the amount of hours to figure out how many miles she drives in an hour (63 mph)

819 miles divided by the speed (63 mph) gives you the amount of hours it takes her to drive 819 miles.

56.6

step-by-step explanation:

the ratio of the perimeters is equal to the scale.

the ratio of the areas is equal to the square of the scale.

34 / 20 = k

a / 19.6 = k²

substituting:

a / 19.6 = (34 / 20)²

a = 19.6 (34 / 20)²

a ≈ 56.6