A boy has to cover 4km to catch a bus. He walks part of the distance at 3km/h and runs the rest at 5km/H. If he takes 1 hour to complete the distance, how many kilometers does he walk?

(c) the diagram shows the first three shapes of a matchsticks arrangement.first shape = 3second shape = 5third shape = 7given m represents the number of matchstick used to arrange the n'th shape.(i) write a formula to represent the relation between m and n. express m as the subjectof the formula.(ii) 19 matchsticks are used to make the p'th shape. find the value of p.