Two trains A and B each of length 100m running on parallel tracks.One overtakes other in 20seconds.One cross other in 10 seconds.Calculate velocity of each train.?

**overtaking =u - v **and** crossing = u +v**, to. dist =100+100=200m , time = t. dist / velo = 20 =200 / u - v =**u-v=10.**.(1) , and 10 = 200/u+v =** u+v=20**..(2) sol 1 2 **u=15 m/s and v=5m/s**