Joe, Pat and Howard take different amount of time to travel to school every day. Joe takes 1$$\frac{1}{4}$$ h to reach school. Pat takes 1$$\frac{2}{5}$$ h to reach school. Howard takes 1$$\frac{1}{10}$$ h to reach school. <hr> Find the difference between the time taken by the person who takes the longest time to reach school and the person who takes the shortest time to reach school.