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.