Converting map scale to unit rate. How many inches are in a mile?

Question

3/10 in = 7/8 ft
(3*8) / (10*7) in = 1 ft
24 / 70 in = 1 ft
0.3428 in = 1 ft

divide both sides by 0.3428

1 in = 2.917 ft
63,360 in are in a mile.

Am i right?

Answer 1

Yes, you're right.

Answer 2

What do the * in between the 3 and the 8 and the 7 and the 10 mean?

Answer 3

Jake, it means multiply.