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

### Instruction:
 Micah, Dean, and Jake are all training for a marathon organized by a local NGO to support children in their town who have cancer. Micah runs 2/3 times as fast as Dean. It takes Jake 1/3 times more time to finish the marathon than it takes Micah. If Dean takes 9 hours, what's the total time the three take to complete the marathon?


### Response:
 他们的速度比例是2:1:1/3。
如果迪恩花费9小时，那么迈卡花费6小时，杰克花费27小时。
总共需要的时间是9 + 6 + 27 = <<9+6+27=42>>42小时。