To determine the ratio of the speeds of the lorry and the car, we first need to calculate the speed of the lorry.
Speed = Distance / Time Speed of the lorry = 100 km / 2 hours 30 minutes
Convert 2 hours 30 minutes to hours: 2 hours + 30 minutes = 2.5 hours
Speed of the lorry = 100 km / 2.5 hours Speed of the lorry = 40 km/h
Now, to find the ratio of their speeds: Ratio of speeds = Speed of lorry / Speed of car Ratio of speeds = 40 km/h / 55 km/h Ratio of speeds = 8/11
Therefore, the ratio of the speeds of the lorry to the car is 8:11.
