3) It takes 2/4 kilometers of thread to make 3/2 boxes of shirts. How

many kilometers of thread will it take to make 8 boxes?

Since it takes 2.25 km to make 3.4 boxes of shirts, you can calculate that each box requires 1.511 km of thread. If you're going to make 8 boxes, then you need 8 times 1.511 km of thread, which is 12.088 km.