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

### Instruction:
Keanu's motorcycle can store 8 liters of gasoline. If his destination is 280 miles away and his motorcycle consumes 8 liters of gasoline per 40 miles, how many times does Keanu have to refill his motorcycle with gasoline if he will make a round trip?

### Response:
 ระยะทางรวมสำหรับการเดินทางไปกลับคือ 280 x 2 = <<280*2=560>>560 ไมล์
ดังนั้นเขาต้องเติมน้ำมันให้มอเตอร์ไซค์ 560/40 = <<560/40=14>>14 ครั้ง