It takes Harry 38s to walk from x1 = - 14m to x2 = - 52m. What is his velocity?

Initial distance from which Harry starts to walk (x1) = - 14 meter

Final distance up to which Harry walks (x2) = - 52 meter

Time taken by Harry to walk from x1 to x2 = 38 second

Then

Velocity = (x2 - x1) / Time taken

= [ - 52 - (-14) ]/38 meter/second

= (-52 + 14) / 38

= - (38/38) meter/second

= - 1 meter/second.

So the velocity at which Harry walks is - 1 meter per second. Hope you are satisfied with the procedure and the procedure is also clear enough for you.