It takes Sara 5 1/2 hours to drive to her aunt's house. She has already driven 3 1/2 hours.
Which of the following equations can be
used to find the amount of time she has left
to drive, x?
a) x - 3 1/2= 5 1/2
b) x + 3 1/2 = 5 1/2
c) X - 5 1/2= 3 1/2
d) x + 5 1/2 = 3 1/2