Type A nerve fibers in humans can conduct nerve impulses at speeds up to 139.8 m/s. How fast is this in mph?

This is a question from my physic homework. I have tried converting 139.8 m/s to mile then to hrs and i got .000241 mph. When I input it it said this is not correct. Please help thanks!

1 answer

139.8 m/s * (1 mile/1609 m) *(3600 s/h)
= 313 mi/h