Answer:
<em> The space in seconds that will be kept = 2.27 seconds</em>
Explanation:
S = d/t..................... Equation 1
making t the subject of formula in the equation above,
t = d/S.................... Equation 2
Where S = speed, d = distance, t = time.
<em>Conversion: (i)if 1 mph = 0.44704 m/s,</em>
<em> then, 30 mph = 30×0.44704 </em>
<em> = 13.41 m/s</em>
<em> (ii) If 1 foot = 0.3048 m</em>
<em> then, 100 foot = 30.48 m.</em>
<em>Given: S = 30 mph = 13.41 m/s, d = 100 foot = 30.48 m</em>
<em>Substituting these values into equation 2</em>
<em>t = 30.48/13.41</em>
<em>t = 2.27 seconds.</em>
<em>Therefore the space in seconds that will be kept = 2.27 seconds</em>
