The length of Lucknow mail is 120 m and ...

The length of Lucknow mail is 120 m and that of Punjab mail is 80 m. These two trains are running in the opposite direction with velocities of 40 km/h and 50 km/h respectively. The time taken by them to cross each other is :

8 s

72 s

12.5 s

none of these

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ARIHANT SSC-TIME, SPEED AND DISTANCE-EXERCISE LEVEL 1

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