A person travelling on a straight line moves with a uniform velocity \( v_{1} \) for a distance \( x \) and with a uniform velocity \( v_{2} \) for the next \( \dfrac{3}{2} x \) distance. The average velocity in this motion is \( \dfrac{50}{7} \, \text{m / s} \). If \( v_{1} \) is \( 5 \, \text{m/ s} \) then \( v_{2} = \underline{\hspace{1cm}} \, \text{m / s} \).
