13. Rahim covers a certain distance in 14 hrs 40 min. He covers one half of the distance by train at 60km/hr and the rest half by road at 50 km/hr. The distance travelled by him is:

14. A boy goes to school with a speed of 3 km/hr and returns to the village with a speed of 2km/hr. if he takes 5 hours in all, the distance between the village and the school is:

15. A and B are tow stations. A trains goes from A to B at 64 km/hr and returns to A at a slower speed. If its average speed for the whole journey is 56 km/hr. at what speed did it return: