• # question_answer A train travelling at 100 km/h overtakes a motorbike travelling at 64 km/h in 40 s. What is the length of the train in metres? A)  1777 m B)  1822 m C)  400 m  D)  1400 m

As both the objects, i.e. the train and the motorbike are moving in the same direction, the relative speed. $\therefore$Length of between them = Difference between the respective speeds $=(100-64)=36\,\,km/h$ $=36\times 40\times 5/18=400\,\,m$