Answer
Find out the how many traffic lights are there on elm street .
To prove
As given
Elm street is 3.6 kilometers Long .
There are sets of 4 traffic lights every 0.6 kilómeter.
i.e
![Traffic\ lights\ in\ one\ kilometer = (4)/(0.6)](https://img.qammunity.org/2019/formulas/mathematics/high-school/9wzou8qryecuz8omg2v3dkeziv7yzv84oo.png)
Now
Traffic light in 3.6 kilometers = Traffic light in one kilometer × 3.6
![Traffic\ light\ in\ 3.6\ kilometers = (4* 3.6)/(0.6)](https://img.qammunity.org/2019/formulas/mathematics/high-school/957dqeyiceqya7m3rdjdvg6z10myf08npw.png)
Traffic light in 3.6 kilometers = 24
Therefore Traffic light in 3.6 kilometers are 24 .