Respuesta :
To do this we need to first multiply by the number of feet in a mile to get:
311520 feet per hour
Then we divide by 3600 to get this into feet per second:
86.53333... feet per second
Now rounding this we get 87 feet per second, the answer is D.
311520 feet per hour
Then we divide by 3600 to get this into feet per second:
86.53333... feet per second
Now rounding this we get 87 feet per second, the answer is D.