To convert miles per hour to feet per second you can do it step by step:
1) Miles to feet:
Multiply the value by 5280
Therefore,
[tex]50\text{ miles }\times\text{ 5280 = 264000 feet}[/tex]2) Hour to second:
1 hour is 60 minutes, and 1 minute is 60 seconds. Thus:
[tex]1\text{ hour = 60min}\times60\sec =3600\text{ seconds}[/tex]Finish making the division (feet/second):
[tex]\frac{264000}{3600}=73.33\text{ }\frac{feet}{\text{second}}[/tex]