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NTA Abhyas 2020
Exam
NTA Abhyas
Year
2020
Subject
Physics
Chapter
Motion in One Dimension

NTA Abhyas 2020 · Physics · Motion in One Dimension

Two stations A and B are 110 km apart on a straight line. One train...

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 xx hours after 7 a.m.

Distance covered by A in xx hours = 20xx km.

Distance covered by B in (x–1)( x – 1 ) hours =25(x–1)km= 25 ( x – 1 ) km

20x+25(x−1)=11020x + 25 ( x - 1 ) = 110

45x=135⇒x=3hr45x = 135 ⇒ x = 3 hr

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