The person is traveling 30 mph.
The car is traveling 45 mph.
Just mulitply 15 x 3 and 10 x 3.
Let’s break the numbers down.
10 + 5 = 15. So we can break 15 down like how you add 15.
10 x 3 = 30.
5 x 3 = 15.
Let’s add 30 and 15 together.
30 + 15 = 45.
Let’s now multiply 10 and 3.
10 x 3 = 30.
I hope this helped!