Solution of problem N4034 probability theory total prob

Solution of problem N4034 probability theory total prob

4034. The number of trucks passing along the highway on which the gas station stands is one of the cars passing along the same highway as 3: 2. It is known that on average one out of 30 trucks and 2 out of 45 cars drive up to a gas station for refueling. What is the probability that a car driving up to a gas station will refuel?

Additional information:

Detailed solution. Decorated in Microsoft Word 2003 (Quest decided to use the formula editor)