"A ladder 15 m long reaches   a window which is 9 m above the ground on one side
Channel: Doubtnut
Date: 2020-07-05

"A ladder 15 m long reaches
 
  a window which is 9 m above the ground on one side of a street. Keeping its
 
  foot at the some point, the ladder is turned to other side of the street to
 
  reach a window 12 m high. Find the width of the street."