Abigail built 10 fences. Each fence took her 30 minutes to build. If she builds fences for the next 8 hours, how many fences would she have built in total?
A step-by-step solution is:
26
8 * 60 = 480 minutes are in the next 8 hours.

Abigail builds 480 / 30 = 16 fences.

Abigail will have built 10 + 16 = 26 fences in total.

.

So, the answer is 26