A boy has Rs 728 in denomination of Rs 2, Rs 5 and Rs 10 notes in ratio of 3:2:4 respectively. What is the total number of notes he has?

The rate of autometres in Baroda are given below For first 2 km Rs 25/- is fixed and every next km Rs 8/- per km. What will be the total length of journey for which average is Rs 10/- per km ?