Question 1. The distance between station A and B is 120 km. A train travelling at a speed can cover the distance in 2 hours 30 minutes. By how many km/h should the speed of the train be increased for it to take 30 minutes less to cover the distance. ? Solution 1. Case 1: Data given: Distance between station A and B = 120 km Time taken by the train = 2 h 30 minutes =(2+30/60) h =5/2 h Speed S1 of the train in km/h = D/S =120/(5/2) =48 km/h Case 2: Distance between station A and B = 120 km Time taken by the train = 2 h Speed S2 of the train = 120/2 =60 km/h Increased speed (S2-S1) = (60-48) km/h =12 km/h Ans. Question 2. Two trains start from the same staion in the smae direction. The speed of the first train is 70 km/h and that of the second train is 20 m/s. 1) Which train is moving faster ? 2) What is the distance between the trains after 1 hour and 15 minutes ? Answer 2. Speed of the first train = 70 km/h Speed of the second train = 20 m/s i)Speed of