Jethro walked at an average speed of 3 miles per hour for 2 hours. randy walked at an average of 4 miles per hour for 3 hours.

which explanation correctly tells how to calculate the total number of miles the two boys walked?

a. step 1: multiply 3 × 2.
step 2: multiply 4 × 3.
step 3: add the two products.

b. step 1: divide 3 ÷ 2.
step 2: divide 4 ÷ 3.
step 3: add the two quotients.

c. step 1: divide 3 ÷ 2.
step 2: divide 4 ÷ 3.
step 3: subtract the two quotients.

d. step 1: multiply 3 × 2.
step 2: multiply 4 × 3.
step 3: subtract the two products.