Two trains 150 m long and 250 m long are...

Two trains 150 m long and 250 m long are travel-ling at the speeds of 30 kmph and 33 kmph , respectively, on parallel tracks in opposite directions. What is the time taken by these trains to cross each other completely form the moment they meet ?

`22 (6)/(7) s`

`21(3)/(7) s`

`22 (1)/(7) s`

`21 (5)/(7) s`

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