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It takes $10$s and $15$s, respectively, for two trains traveling at a different constant speeds to completely pass a telegraph post. The length of the first train is $120$ m and that of the second train is $150$ m. The magnitude of the difference in the speeds of the two trains (in m/s) is _________

  1. $2.0$
  2. $10.0$
  3. $12.0$
  4. $22.0$
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difference of speeds = $ (\frac{120}{10} – \frac{150}{15})= 2\text{ m/s} $
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