Kanchan was traveling in a boat, suddenly the wind blew her stole in the water and it started flowing back, she kept moving her boat in the forward direction. She realized after 22.5 minutes that her stole is not present on her shoulder. She turned her boat towards stole and caught it up as soon as it reached the starting point. If her stole fell down from the boat exactly at 14.4 km from where she started, Find the speed of the stream.