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If the average of '$n_1$' numbers is $a_1$ and the average of '$n_2$' numbers is $a_2$, then average of total numbers $n_1$ and $n_2$ is
Average = ${n_1a_1 + n_2a_2}/{n_1 + n_2}$
If A goes from P to Q with speed x km/h and returns from Q to P with speed y km/h, then the average speed of total journey is
If each number is multiplied by a certain number, then the average is also multiplied by that number.
Required average =p×q