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

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

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

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