Dale drove 315 miles in 5 hours.
At the same rate, how many miles would he drive in 7 hours?

441 miles.

Explanation:

First, we have to try to find how many miles he can drive in 1 hour. To do this, we need to divide 315 by 5. This will give us 63. So now we know that 63 miles = 1 hour.

Next, now that we know the how many miles he drives in an hour, we use 63 in this equation: 7(miles in an hour). If we transfer all of the values into the equation, the equation will be: 7(63) or 7 x 63.

Then, now we know the equation we need to solve the problem. We have to solve it. So 7 x 63 is 441 miles.

Finally, we solved the problem!