Q.4 The outer circumference of a circular track is 220 m. The track is 7 m wide everywhere. Calculate the cost of levelling the track at the rate of 50 paisa/square meter ?
Q.5 P can do a piece of work in 12 days. He works at it for 4 days and then Q finishes it in 16 more days. In how many days will P and Q together finish the work ?