Can someone please explain the steps in order to answer this question?

If Johnny ran 100 meters in 9.92 seconds, how many feet did he run per second?

I have tried to figure this out but can't.

My second question is this:

If a rectangle in 9in long on one side & 6in on the other; how many meters squared is it?

I do not understand why i woul dhave to convert this into centimeters first the way our teaher did--can someone please explain that and then explain the steps?

I would really appreciate all help on this, i am just learning and already confused!