Paul draws a plan of his school using a scale of $$2\text{cm}$$ to $$5\text{m}$$.  The real length of the hall is $$15\text{m}$$ long.  What is the length of the hall on the plan? 
选项为:A:$$15\text{cm}$$  B:$$6\text{cm}$$  C:$$18\text{cm}$$  D:$$9\text{cm}$$  E:$$12\text{cm}$$  请回答其中一个选项.