Ms. Todd walked 3,600 steps in 24 hours yesterday. How many steps did she walk per hour?

To find the number of steps Ms. Todd walked per hour, we divide the total number of steps (3,600) by the number of hours (24).

So, Ms. Todd walked 3,600 steps / 24 hours = <<3600/24=150>>150 steps per hour. Answer: \boxed{150}.