Two trains are moving in opposite diction s at the speed of 50 and 70 km. per hour. their length are 150 m and 100 m . the time required for their crossing each other is:

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Two trains are moving in opposite diction s at the speed of 50 and 70 km. per hour. their length are 150 m and 100 m . the time required for their crossing each other is:

5 seconds

7.5 seconds

None of these

40 seconds