The length of the line is $$4000\times 2\times 3\text{cm=}24000\text{cm=}240\text{m}$$. 
The radius of a coin is $$3\text{cm}$$. When $$4000$$ of these coins are placed side by side in a straight line, how long would this line be? 
Options:
1: $$240\text{cm}$$ 
2: $$12\text{m}$$ 
3: $$240\text{m}$$ 
4: $$1.2\text{km}$$ 
5: $$2.4\text{km}$$ 