Valerie roller-skated 4 miles at an average speed of 8 mph. she started her skate at 4: 15 p. m.

which explanation correctly tells how to calculate what time it was when valerie finished her skate?

a.
step 1 divide: 8 ÷ 4.
step 2 multiply that quotient by 60.
step 3 add the number of minutes to 4: 15 p. m.

b.
step 1 multiply: 8 × 4.
step 2 multiply that product by 60.
step 3 add the number of minutes to 4: 15 p. m.

c.
step 1 multiply: 8 × 4.
step 2 divide that product by 60.
step 3 add the number of minutes to 4: 15 p. m.

d.
step 1 divide: 4 ÷ 8.
step 2 multiply that quotient by 60.
step 3 add the number of minutes to 4: 15 p. m.