Question 13
Ahmad and George took a circular route of 7 km that starts and ends at the same point. They started at the same time, took the route in opposite directions, and finished at the same time. Ahmad walked at a constant speed all along the route. George walked at a constant speed for the first 3 km then increased his speed by 7 km/hr, and kept this constant speed for the remaining distance. They met only once during the walk, that was, when Ahmad had covered 4.5 km of the distance. How many hours did it take them to finish the 7 km distance?