Average speed over successive stretches covered at different speeds

1. A.
   $\frac{2v_{1}v_{2}}{v_{1} + v_{2}}$
2. B.
   $\frac{2x}{v_{1} + v_{2}}$
3. C.
   $\frac{v_{1}v_{2}}{2\left( v_{1} + v_{2} \right)}$
4. D.
   $\frac{v_{1} + v_{2}}{2}$

Tap an option to check your answer.

1. A.
   $3.50\text{ }km/h$
2. B.
   $4.25\text{ }km/h$
3. C.
   $4.00\text{ }km/h$
4. D.
   $3.75\text{ }km/h$

Tap an option to check your answer.

1. A.
   $\frac{\left( v_{1} + v_{2} + v_{3} \right)}{3v_{1}v_{2}v_{3}}$
2. B.
   $\frac{\left( v_{1} + v_{2} + v_{3} \right)}{3}$
3. C.
   $\frac{3v_{1}v_{2}v_{3}}{\left( v_{1}v_{2} + v_{2}v_{3} + v_{3}v_{1} \right)}$
4. D.
   $\frac{v_{1}v_{2}v_{3}}{3\left( v_{1}v_{2} + v_{2}v_{3} + v_{3}v_{1} \right)}$

Tap an option to check your answer.

1. A.
   $v = v_{1} + v_{2}$
2. B.
   $v = \frac{v_{1} + v_{2}}{2}$
3. C.
   $\frac{2}{v} = \frac{1}{v_{1}} + \frac{1}{v_{2}}$
4. D.
   $\frac{1}{v} = \frac{1}{v_{1}} + \frac{1}{v_{2}}$

Tap an option to check your answer.

1. A.
   $8.8\text{ }m/s$
2. B.
   $10\text{ }m/s$
3. C.
   $9.2\text{ }m/s$
4. D.
   $8\text{ }m/s$

Tap an option to check your answer.