Mr. Kumar wants to travel 1800km distance. During his journey, he took 5 hrs of flight, 15 hrs of a train, and 20 hrs of a car to complete the journey. The speed of the car he used was 40km/hr. If had used only flight and car he would have saved 10 hrs. Find the excess time required if wishes to use only Train and Car for the return journey, time spent on train and car during return journey is 3 : 2.