Multiple choice

A man standing on a railway platform observes that a train going in one direction takes $4\ s$ to pass him. Another train of same length going in the opposite direction takes $5\ s$ to pass him. The time taken (in second) by the two trains to cross each other will be

  1. $\dfrac {32}{9}$
  2. $\dfrac {33}{7}$
  3. $\dfrac {40}{9}$
  4. $\dfrac {49}{9}$
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