Ms Todd walked 3600 steps in 24 hours yesterday. How many steps did she walk in an hour?

To find out how many steps Ms Todd walked in an hour, we need to divide the total number of steps (3600) by the number of hours she walked (24).

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