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

### Instruction:
Yvonne swims 10 laps in 5 minutes.  Her younger sister can swim half as many laps as Yvonne in the same time frame.  Their brother Joel can swim three times the number of laps as the youngest sister.  How many laps can Joel swim?

### Response:
 น้องสาว: 10/2 = <<10/2=5>>5 รอบ
น้องชาย: 5 x 3 = <<5*3=15>>15 รอบ