Question

A driver can stop his car from the red signal at a distance of of 20 m when he drives at 36 kmph

and 41.25 m when he drives at 54 kmph find his reaction time

Answer 1

Answer: 2.0 seconds & 2.75 seconds

Explanation:

`d=(s* r)/(3.6)\quad where;\\\\\bullet d=\text{reaction distance (in meters)}\\\bullet s=\text{speed (in km/hr)}\\\bullet r=\text{reaction time (in seconds)}\\\bullet 3.6=\text{needed to convert km/hr into meters/second}\\\\\\\large{\text{When d=20m and s=36}}\\\\20=(36)/(3.6)* r\\\\20=10r\\\\\large{\boxed{2=r}}\\\\\\\text{When d=41.25m and s=54}\\\\41.25=(54)/(3.6)* r\\\\41.25=15r\\\\\large\boxed{2.75=r}`