Alright, lets get started.
Jen picked three fourth in half an hour.
Half an hour means 30 minutes.
At the same rate, how many she can pick in 2 hours.
2 hours means
minutes
Now,
In 30minutes, Jen can pick = ![\frac{3}{4}](https://tex.z-dn.net/?f=%5Cfrac%7B3%7D%7B4%7D)
In 1 minute, Jen can pick = ![\frac{3}{4} *\frac{1}{30}](https://tex.z-dn.net/?f=%5Cfrac%7B3%7D%7B4%7D%20%2A%5Cfrac%7B1%7D%7B30%7D)
In 120 minutes, Jen can pick = ![\frac{3}{4} *\frac{1}{30} * 120 = 3](https://tex.z-dn.net/?f=%5Cfrac%7B3%7D%7B4%7D%20%2A%5Cfrac%7B1%7D%7B30%7D%20%2A%20120%20%3D%203)
Hence Jen can pick complete 3 in 2 hours of time.
So the answer is 3 : Answer
Hope it will help :)