Image is question

                          H   3.1     FS

                                          1.7

Middle School      4.3        TH

Distance between School and Fire Station  =  sqrt ( 4.3^2 + 1.7^2 )  = 4.6 miles

Distance between  School and Hospital  =  sqrt [ (4.3 - 3.1)^2 + 1.7^2 ] = 

sqrt [ ( 1.2)^2 + 1.7^2 ]  =  2.1 miles