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NTA Abhyas JEE Main2020PhysicsMotion in One DimensionPractice

Two stations A and B are 110 km apart on a straight line. One train starts from A at 7 a.m. and travels towards B at 20 kmph. Another train starts from B at 8 a.m. and travels towards A at a speed of 25 kmph. How many hours after the start, the train which starts from station A, will meet the other train which is coming from station B?

Correct answer

3

Step-by-step solution

Suppose they meet x hours after 7 a.m. Distance covered by A in x hours = 20 x km. Distance covered by B in ( x   –   1 ) hours =   25   ( x   –   1 )   k m 20 x   +   25   ( x -   1 )   =   110 45 x   =   135 ⇒   x   =   3 hr

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