A moving company drove one of its trucks 100,042 miles one year. A second truck was driven 98,117 miles, and a third truck was driven 120,890 miles. How many miles were driven by all three trucks?

To calculate the total miles driven by all three trucks, we need to add the miles driven by each truck together:

- Truck 1: 100,042 miles
- Truck 2: 98,117 miles
- Truck 3: 120,890 miles

Now, let's do the addition:

100,042 + 98,117 + 120,890

Starting with the first two:

100,042 + 98,117 = 198,159

Now, add the miles of the third truck:

198,159 + 120,890 = 319,049

Therefore, the total miles driven by all three trucks is **319,049 miles**.

The correct answer is: **319,049 miles**.