Please help with this math problem!

Question

A phone line runs east along a field of 1.8 miles and then north along the edge of the same field for 2.5 miles. If the phone line cost 3500 per mile to install, how much could have been saved if the phone line had been installed diagonally across the field?

Answer 1

The diagonal is 3.08 miles (Pythagorean Theorem)

The distance along the sides of the field is 4.3 miles.

The diagonal is 1.22 miles shorter.

You figure out the cost saving.