<image> The process depicted in the image is: Xiao Ming runs from home to the gym, exercises there for some time, then walks to Xinhua Bookstore to buy books, and finally walks back home. In which the time $$t($$minutes$$)$$ represents the distance $$s($$kilometers$$)$$ Xiao Ming is from home, so the total time Xiao Ming spends exercising at the gym and buying books at Xinhua Bookstore is ______ minutes.