A trip takes 7 3/4 hours and 2/3 of the trip is done how much longer to the end of the trip

I think the answer is 4 7/12 hours.

Total trip time: 7 3/4

time spent: 2/3

time left: total time - time spent

= 7 3/4 - 2/3

=31/4 - 2/3

by taking lcm:

= (63-8) / 12

= 55/12

= if in decimals: 4.583

= if in mixed numbers: 4 7/12

so the time left is 4 7/12 hours