Respuesta :

To find out how many feet in 1 second we have to divide;-

52.4 ÷ 400 = 0.131
0.131 feet per sec.

CHECK OUR WORK:-

0.131 × 400 = 52.4
We were RIGHT!!!

So, 0.131 feet per second.

Hope I helped ya!! xD
0.131 feet per second is the answer

to prove it , 0.131*400=52.4     before that it's 52.4/400=0.131

i hope this helps