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.