[" Fin whe covering a distance of "24km" ,a man noticed that after walking for "],[" Ex.4.While covering a distance covered by him was "(5)/(7)" ,of the remaining distance."],[" I hour and "40" minutes,the tistance covered by him was "(5)/(7)" .of the remaining distance "],[" I hour and "40" minutes,the tires per second? "],[" What was his speed be "x" km /hr."],[" Sol.Let the speed be "x" km "/" hr."]