#45/60 = 3/4#
If the remaining time after #45# minutes - #15# minutes, sets them #200# miles apart, then each quarter is 200 miles, as #15/60 = 1/4#. We need to determine the value of #4/4#. Write an equation and solve: #x/4 = 200# #x = 4*200# #x = 800# miles