Respostas

2014-08-23T10:42:03-03:00
16m = 1s
400m = x

Logo:

16x=400
x = 400
       16

x = 25s
2 5 2
2014-08-23T10:43:11-03:00
1s--------16m
x----------400
x=400/16
x=25s
25 s leva para correr 400m
2 4 2