Two cars A and B are running in the same direction. Car A had already covered of 60 km when car B started running. The cars meet each other in 3 hours after car B started running . What was the speed of car A?
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We can make only 1 equation , but there are two variables, it is clear that their relative speed is 20 km / hr, ie B is 20km/hr faster than A. But individual speed cant be determined.
20 km/ hr
The distance which car B has to cover to meet car A is 60km, but not with his own speed, but with relative speed of car A and B.
So relative speed is A-B and distance is covered in 3 hours so this relative speed is 60/3 ie 20km/hr.
But we do not know the speed of B so cannot find individual speeds.