Question

A woman driving a car 14 ft long is passing a truck 30 ft long. The truck is

traveling at 50 mi/h.

How fast must the woman drive her car so that she can pass the truck

completely in 6 seconds, 

Answer 1

$30\ ft=9.144\ m$

$14\ ft=4.2672\ m$

$50\ mi/h=22.352\ m/s$

$(v_2-v_1)t=s_1+s_2\to(v_2-22.352)\cdot6=9.144+4.2672\to$

$v_2=24.5872\ (m/s)=55\ (mi/h)$ . Answer