Step-by-step explanation
In the question, we are given that;
Since each of the vehicles is equally likely to leave;
Part A
Answer: 0.3
Part B
Answer: 0.1
Part C
First we find the probability of a lorry or van leaving
Next, we find the probability of a car; but remember that one of either a lorry or van has left the car park already, so the total number of vehicles will reduce by 1
Therefore, the probability of a car leaving second if either a lorry or van had left first is
Answer: