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A train overtakes two persons who are walking in the same direction in which the train is going, at the rate of 2 kmph and 4 kmph, and passes the completely in 9 and 10 seconds respectively. The length of the train is:

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Important Questions on Problems on Trains

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Quantitative Aptitude Self Study Material>Chapter 18 - Problems on Trains>Problems on Trains>Q 28
A train overtakes two persons walking along a railway track. The first one walks at 4.5 km/hr. The other one walks at 5.4 km/hr. The train needs 8.4 and 8.5 seconds respectively to overtake them. What is the speed of the train if both the persons are walking in the same direction as the train?
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Quantitative Aptitude Self Study Material>Chapter 18 - Problems on Trains>Problems on Trains>Q 29
A train travelling at 48 kmph completely crosses another train having half its length and travelling in opposite direction at 42 kmph, in 12 seconds. It also passes a railway platform in 45 seconds. The length of the platform is 
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Quantitative Aptitude Self Study Material>Chapter 18 - Problems on Trains>Problems on Trains>Q 30
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. At what time will they meet?