Question

3/10 in. = 78 mi.

Answer 1

i think in=inch

Answer 2

right @xclaireykinzx

Answer 3

\[3/10 [\text{in}] : 78 [\text{mi}]\]
\[3/10 [\text{in}] : 78 [\text{mi}]\times\frac{1760[\text{yd}]}{[\text{mi}]}\times\frac{3[\text{ft}]}{[\text{yd}]}\times\frac{12[\text{in}]}{[\text{ft}]}\]