A contracting company is doing work on a roof. The height of the house is 20 feet and the bottom of the ladder is placed 6 feet away from the house. How long is the ladder?

Please can someone help me with this question? (And explain if possible)
Thank you :)
The topic is the Pythagorean theorem.

$12. that is my answer.

54 km / hours

step-by-step explanation:

we need to convert seconds to hours

60 seconds = 1 minutes

60 minutes = 1hour

15 m         60 second   60 minutes

  * *         = 54000 meters/ hour

second     1 minute             1 hour

now we need to convert meters to km

1000 m = 1 km

54000 m       1 km

*   = 54 km / hours

hour               1000m