The distance between two stations A and B is 100 km. A train leaves A towards B at an average speed of 80 km/hr. After half an hour, another train leaves B towards A at an average speed of 100 km/hr. The distance of the point where the two trains meet, from A is:
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Then, ( x/80 ) - ( 220 - x ) / 100 = 1/2
⇒ 5x - 4( 220 - x ) = 200
⇒ 9x = 1080
⇒ x = 120 km
∴ Required distance = 120 km
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see exlanation
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the answer is
after
36 minutes
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