Answer:
4 seconds
Step-by-step explanation:
Rate : 0.4 feet per second = 0.4 ft / 1 second
To solve for the missing number in the ratio, set the ratio equal to the given rate:
[tex]\frac{0.4ft}{1sec} =\frac{xft}{ysec}[/tex]
[tex]\frac{0.4ft}{1sec}=\frac{\frac{3}{10} ft}{\frac{3}{x} sec}[/tex]
[tex]\frac{0.4ft}{1sec} = \frac{0.3ft}{\frac{3}{x} sec}[/tex]
[tex]0.4ft * \frac{3}{x} sec = 0.3ft * 1 sec[/tex]
[tex]\frac{3}{x} =0.3/0.4 = 0.75[/tex]
3 = 0.75x
x = 3/0.75 = 4 seconds
0.3ft / 0.75 sec = 0.4 ft / 1 sec
