Below is an instruction that describes a task. Write a response that appropriately completes the request in English. Please answer in English.

### Instruction:
Lydia is planning a road trip with her family and is trying to plan a route. She has 60 liters of fuel and she will use all of this during her trip. She isn't sure how much fuel she is going to use in the first third of the trip but she knows she will need a third of all of her fuel for the second third of the trip, and half this amount for the final third of the trip. How much fuel, in liters, can Lydia use in the first third of the trip?

### Response:
In the first third of the trip, Lydia can use 60 L of fuel.
In the second third of the trip, Lydia will use 60 L * 1/3 = <<60*1/3=20>>20 L of fuel.
In the final third of the trip, Lydia will use 60 L * 1/3 * 1/2 = <<60*1/3*1/2=10>>10 L of fuel.
So, Lydia can use 60 L - 20 L - 10 L = <<60-20-10=30>>30 L of fuel in the first third of the trip.
#### 30

