Gervais drove an average of 315 miles for 3 days. Henri drove a total of 1,250 miles over one week. How many miles farther did Henri drive?
Let's think step by step below.
305
Gervais drove 3 * 315 = 945 miles.

1250 - 945 = 305 miles.

Henri drove 305 miles farther.

.

Thus, the answer is 305