Question 171994
Distance is 13.5 miles

Height of platform=h in feet

We need to convert distance into feet

1 mile=5280 feet

13.5 miles*5280 feet/1mile=71,280 feet

the equation to be solved is

71,280=1.3(h)sqroot

Divide both sides by 1.3

54,830.769=hsqrt

Square both sides

 3,006,413,254.4 =h

3,006,413,254 feet=h

If you are using a nautical mile you need to convert the miles by multiply by 6076 feet and replace 5280.