Question

A man covers half of his journey at 6 km/h and the remaining half at 3 km/h. His average speed is

Answer 1

Let the Total distance be $x$

The half distance is covered with $6kmph$ so the time taken is $\frac{\frac{x}{2}}{6}=\frac{x}{12}$

The half distance is covered with $3kmph$ so the time taken is $\frac{\frac{x}{2}}{3}=\frac{x}{6}$

Avg speed $=\frac{Totaldistance}{Totaltime}=\frac{x}{\frac{x}{6}+\frac{x}{12}}\frac{72x}{12x+6x}\frac{72}{18}=4$