delhi is at a distance of 200 km from ambala. A sets out from ambala at a speed of 30 km/hr and B sets out at the same time from delhi at a speed of 20 km/hr. when will they meet each other?

say after t sec they will meet each other.

So at t sec distance covered by A=30t

So at t sec distance covered by B=20t

as  thery meet after this t sec so: 30t+20t=200

                                                   t=200/50  =4 hr