How many seconds of space should you keep between you if you're driving a 100 foot truck 30 mph?

The space in seconds that will be kept = 2.27 seconds

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.

Conversion: (i) if 1 mph = 0.44704 m/s,

then, 30 mph = 30*0.44704

= 13.41 m/s

(ii) If 1 foot = 0.3048 m

then, 100 foot = 30.48 m.

Given: S = 30 mph = 13.41 m/s, d = 100 foot = 30.48 m

Substituting these values into equation 2

t = 30.48/13.41

t = 2.27 seconds.

Therefore the space in seconds that will be kept = 2.27 seconds