Question

please solve this question​

Answer 1

Answer:

Average Speed = Total DIstance / Total Time 

                         = $2x$ $(\frac{x}{v_{1} }+\frac{x}{v_{2} })$  

                         =$2(\frac{1}{v_{1} } +\frac{1}{v_{2} })$$2(v_{2} +\frac{v_{1}}{v_{1} v_{2} })$

                         = $2(v_{2} +\frac{v_{1}}{v_{1} v_{2} })$

                         = 2$\frac{2v_{1}v_{2}}{v_{1}+v_{2} }$

Hope it helps :)