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

### Instruction:
 Jacob can write twice as fast as Nathan. Nathan wrote 25 letters in one hour. How many letters can the two write in 10 hours together?


### Response:
 由于Nathan每小时写25封信，Jacob每小时写25*2 = <<25*2=50>>50封信。
他们一起每小时写75封信，
在10小时内，他们一共写75*10 = <<10*75=750>>750封信。