janice rode her bike at an average of 12 miles per hour for 3 hours. renee rode her bike at an average of 14 miles per hour for 2 hours.

which explanation correctly tells how to calculate how many more miles janice rode her bike than renee?

a.
step 1 divide: 12 ÷ 3.
step 2 divide: 14 ÷ 2.
step 3 add the two quotients.

b.
step 1 divide: 12 ÷ 3.
step 2 divide: 14 ÷ 2.
step 3 subtract the two quotients.

c.
step 1 multiply: 12 × 3
step 2 multiply: 14 × 2.
step 3 add the two products.

d.
step 1 multiply: 12 × 3
step 2 multiply: 14 × 2.
step 3 subtract the two products.