Engine or Wheels

A car is considered faulty if it breaks down before it travels 15,000 km. A breakdown happens if there is something wrong with its engine (probability $15\%$) or something wrong with its wheels (probability $10\%$). The two issues are independent and a car can have both. These are the only possible causes of a breakdown.

Don buys a new car and it breaks down after 9,000 km. What is the probability that something is wrong with the wheels?

Give your answer as an exact fraction.