Answer:
47 MPH
Step-by-step explanation:
Note: This is all assuming you know the speed of the peregrine falcon as 240 MPH (real life speed). If it is a different speed in your equation, please let me know and I'll fix it.
The peregrine falcon travels at 240 MPH. One fifth of 240 is 48. 48 - 1 = 47. A sailfish can swim 47 MPH