$A$, $B$ and $C$ start from the same place at the same time and chase a cyclist in front of them along the same road. The three cars catch up with him in $6$, $10$ and $12$ minutes respectively. Given that car $A$\textquotesingle s speed is $24$ kilometers per hour, car $B$\textquotesingle s speed is $20$ kilometers per hour. Find car $C$\textquotesingle s speed. 
选项为:A:$$21$$  B:$$19$$  C:$$18$$  D:$$16$$  E:$$15$$  请回答其中一个选项.