if it's runing at 61 Miles Per Hour, an hour is 60*60 seconds, or 60 seconds, times 60 minutes. Next, we would take this and do
61/60 minutes/60 seconds.
This gets us to:
0.016944.. miles per second, or, thanks to the conversion from feet to miles being 5280 feet, that is
which gets us to our final answer of:
89.46432 feet per second.
I hoep you enjoy yuor day.