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

### Instruction:
The bald eagle can dive at a speed of 100 miles per hour, while the peregrine falcon can dive at a speed of twice that of the bald eagle.   Starting from the same treetop, if it takes the bald eagle 30 seconds to dive to the ground, how long,  in seconds, will it take the peregrine falcon to dive the same distance?

### Response:
Since the peregrine falcon dives at twice the speed of the bald eagle, it will take the peregrine falcon half as long as the bald eagle to travel to the ground.
Thus, it will take the peregrine falcon 30/2=<<30/2=15>>15 seconds to travel to the ground.
#### 15