Algebra & Manipulation · Superchallenge problem

Ana, Ben and Cy share a taxi from the airport along one road. Ana gets out after $6$ km, Ben after $10$ km, and Cy at the end, after $14$ km. The fare is $\$42$ for the whole $14$ km, charged at a steady rate per km. They split it fairly: the cost of each stretch of road is shared equally by the people in the taxi during that stretch. How many dollars does Cy pay?