Question

The greatest recorded depth of Antarctic ice sheet was recorded at 15,400 feet. A mile is 5,280 feet. Estimate how many miles thick the ice is?

Answer 1

If a mile is 5.280 feet  and the ice sheet was recorded at 15.400 feet

  15400 divided by 5.280   = the number of miles. 
  15400 : 5280 = 2,916 miles thick is the ice sheet