Confusion in Kite Flying: Understanding Ambiguous Homework Questions

[Willowz]

Homework Statement

I can't really understand this question. Either it is too ambiguous or I'm not seeing something.

A girl flies a kite at a height of 300ft, the wind carrying the kite horizontally away from her at a rate of 25 ft/s. How fast must she let out the string when the kite is 500ft away from her?

Is the hypotenuse 500ft or the base 500ft?

 

[ArcanaNoir]

sounds like the hypotenuse.