For a world record, George Adrian picked 15,832 pounds of apples in 8 hours. Assuming he maintained a constant rate of picking, how many pounds of apples did he pick in 3 hours?
In $\frac{3}{8}$ as many hours, George picks $\frac{3}{8}$ as many pounds of apples.  Therefore, George picked $\frac{3}{8}(15,\!832)=\frac{3}{8}(16,\!000-168)=3(2000)-3(21)=\boxed{5937}$ pounds of apples in 3 hours.