It takes $10$ s and $15$ s, respectively, for two trains travelling at 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 ____________. $2.0$ $10.0$ $12.0$ $22.0$

asked
Jan 25, 2017
in Numerical Ability
makhdoom ghaya
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