(ii) Again,Now,And,Speed-Distance travelledTime takenDistance travelled by train B = 180 kmTime taken by train B = 4 h180 kmSpeed of train B =4h= 45 km/hSo,Thus, the speed of train B is 45 kilometres per hour.-(2)hereas the train B travels a distance of 45 kilometres in one hour. Since the speed of train B is higher,terefore, train B has travelled faster.Sample Problem 3. A car travels 30 km at a uniform speed of 40 km/h and the next 30 km at a uniformeed of 20 km/h. Find its average speed.Solution. (1) First the car travels a distance of 30 kilometres at a speed of 40 kilometres per hour. Let usnd out the time taken by the car to travel this distance.Here,Speed = 40 km/hDistance = 30 kmAnd,Time = ?(To be calculated)DistanceWe know that,SpeedTimeSo,3040 =Time30Time = hours40And,From the above calculations we find that the train A travels a distance of 40 kilometres in one hour​