When a truck full of boxes arrives at the Silvergrove Post Office, Miguel unloads the truck by placing the boxes on a conveyor belt. Miguel's coworkers are impressed with how fast Miguel does his job. Miguel can unload 10
boxes in 5 minutes. How long does it take him to unload 40 boxes?

20 minutes

Step-by-step explanation:

If Miguel can unload 10 boxes in 5 minutes, that means that he loads 2 boxes per minute. Assuming he he has a constant unloading speed, it would take him 20 minutes to unload all 40 boxes.

I found this by dividing 40 (boxes) by 2 (min per box)

lockers 1, 4, 9, 16, 25, 40, and 49 are open

i ran through it by the other answer is wrong