Answer:
4.95 seconds
Explanation:
It is given that the speed of the cars are constant and not accelerating
The relative speed between the two cars will be the difference in their speeds
[tex]S_r=60-20\\\Rightarrow S_r=40\ km/h[/tex]
Converting to m/s
[tex]1\ km/h=\frac{1}{3.6}\ m/s[/tex]
[tex]\\\Rightarrow 40\ km/h=40\times \frac{1}{3.6}\ m/s\\ =\frac{100}{9}\ m/s\\ =11.11\ m/s[/tex]
Time = Distance / Speed
[tex]Time=\frac{55}{\frac{100}{9}}=4.95\ seconds[/tex]
Time it would take the faster car to cross the slower car is 4.95 seconds
