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Two trains of lengths 120 m and 90 m are...

Two trains of lengths 120 m and 90 m are running with speeds of 80 km/hr and 55 km/hr respectively towards each other on parallel lines. lf they are 90 m apart, after how many seconds they will cross each other? `5. 6\ s e c` b. `7. 2\ s e c` c. `8\ s e c` d. `9\ s e c`

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