Distance between Bholu's and Golu's house is 9 km. Bholu has to attend Golu's birthday party at 7 O'clock. He started his journey from his home at 6 O'clock on his bicycle and covered a distance of 6 km in 40 min. At that point, he met Chintu and he spoke to him for 5 min and reached Golu's birthday party at 7 O'clock. With what speed, did he cover the second part of the journey? Calculate- his average speed for the entire journey.
