Ok so we know that using 1/3 of the tank, Tanya managed to drive 3 1/2 hours.
That means if she used the entire tank, w
she would have been able to drive 3 times as long, or (3 1/2 x 3) hours, which is 10 1/2 hours.
This means if she used half the tank (1/2), she would have driven half of 10 1/2 hours, which is 5 1/4 hours
Hope this helped
