Answer:
6 hours
Step-by-step explanation:
She can make 15 necklaces in 2 hours. Which means, in another 2 hours, she's going to make another 15 necklaces. So in 2+2 hours, she would be making 15+15 necklaces.
That is, in 4 hours, she would be making 30 necklaces.
And in another 2 hours, another 15 necklaces would be made.
In 4+2 hours, she would have made a total of 30+15 necklaces. Which means, in 6 hours, she would make 45 necklaces.
Another way to get this is:
If she makes 15 necklaces in 2 hours.
Then 45/15 gives 3.
Multiply the 3 to 2 gives 6 hours.
