SSC CGL 20161)X and Y are two stations which are 280 km apart. A train starts at a certain time from X and travels towards Y at 60 kmph. After 2hours, another train starts from Y and travels towards X at 20 kmph. After how many hours does the train leaving from X meet the train which left from Y?
4 hours
Distance between X and Y = 280 km
Distance covered by train starting from X in 2 hours = 2 x 60 = 120km. Remaining distance = 280 - 120 = 160km Relative speed = 60 + 20 = 80kmph Time taken to cover 160km 160/80 = 2hours Required time of meeting = 2+2 = 4hours