Mr Kamal departed from his house to a restaurant at 10.45 in the morning. His average speed for the journey is 84km/h. He reached the restaurant at 11.05 in the morning and stopped to eat for 3/4 hour. Then, Mr Kamal continued the journey to town P which is 120km away, with an average speed of 90km/h. Calculate the average speed, in km/h, of the journey of Mr Kamal.
