A ranger in a national park is driving at 49 km/h when a deer jumps onto the road 67 m…

A ranger in a national park is driving at 49 km/h when a deer jumps onto the road 67 m ahead of the vehicle. After a reaction time of t s, the ranger applies the brakes to produce a deceleration of 3.5 m/s2.
What is the maximum reaction time al- lowed if the ranger is to avoid hitting the deer?
Answer in units of s