On Saturday, Siena drove a total of 120 miles in 2 hours. On Sunday, she drove a total of 110 miles in 2 hours.



Which explanation correctly describes a way to calculate how much faster Siena drove per hour on Saturday?







A.

Step 1 Divide: 120 ÷ 2.
Step 2 Divide: 110 ÷ 2
Step 3 Add the two quotients.






B.

Step 1 Multiply: 120 × 2
Step 2 Multiply: 110 × 2
Step 3 Add the two products.






C.

Step 1 Multiply: 120 × 2
Step 2 Multiply: 110 × 2
Step 3 Subtract the two products.






D.

Step 1 Divide: 120 ÷ 2.
Step 2 Divide: 110 ÷ 2
Step 3 Subtract the two quotients.