To solve this task, you will need to know that:

Stopping distance is made up of reaction distance/thinking distance and braking distance.

Reaction distance is a function of reaction time and speed.

If you are driving at 60 km/h, that means you are travelling 60 000 metres in 3 600 seconds. If your reaction time is 1 second, you travel about 17 metres in your reaction time (because 60 000/3 600 is approximately 17).

Stopping distance is therefore about 35 metres in this case (17 metres reaction distance + 18 metres braking distance). Stopping distance is therefore about 35 metres in this case (17 metres reaction distance + 18 metres braking distance).