(1).A 300m long train is moving with a u...

(1).A `300m` long train is moving with a uniform velocity of `90`km/h.The time taken by the train to cross another train of length `700m` moving with same speed in opposite direction is [NCERT Pg.51]
(1) `56s`
(2) `68s`
(3) `20s`
(4) `92s`

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