6. Find the distance

John enters the circular bridge through exit A and wishes to leave through exit B. If John chooses to reach the exit B by taking the road connecting the two parallel roads, find the distance between the two parallel. Given, the length of the parallel roads are 24 \(km\) and the distance between the point \(D\) on the diagonal road to the central pole \(P\) is 15 \(km\).

 

 

Answer:

 

The distance between the two parallel roads is  \(km\).