"G is father in law of D" G+H means G is father of H H is either son or daughter of G H-R means H is sister of R R@D means R is wife of D so H and R are sisters and daughters of G so husband of R i.e. D is son in law of G or G is father in law of D
The length of two superfast trains are 140 mts and 160 mts respectively. If they run at the speed of 60 km/hr and 80 km/hr respectively in opposite direction, find the time in which they will cross each other ?