Time for a runner from A to catch one running perpendicular to AB from B

1. A.
   $\left\lbrack \frac{x}{v - v_{1}} \right\rbrack^{1/2}$
2. B.
   $\left\lbrack \frac{x}{v_{1} - v} \right\rbrack^{1/2}$
3. C.
   $\left\lbrack \frac{x^{2}}{v^{2} - v_{1}^{2}} \right\rbrack^{1/2}$
4. D.
   $\left\lbrack \frac{x^{2}}{v_{1}^{2} - v^{2}} \right\rbrack^{1/2}$

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1. A.
   $\frac{b}{\sqrt{V_{1}\ ^{2} + V_{2}\ ^{2}}}$
2. B.
   $\frac{b}{V_{1} + V_{2}}$
3. C.
   $\frac{b}{V_{2} - V_{1}}$
4. D.
   $\frac{b}{\sqrt{V_{2}\ ^{2} - V_{1}\ ^{2}}}$

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1. A.
   $\left[\dfrac{a^2}{(V^2 - V_1^2)}\right]^{\frac{1}{2}}$
2. B.
   $\left[\dfrac{a^2}{(V_1^2 - V^2)}\right]^{\frac{1}{2}}$
3. C.
   $\left[\dfrac{a^2}{(V^2 - V_1^2)}\right]$
4. D.
   $\left[\dfrac{a^2}{(V_1^2 - V^2)}\right]$

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