Select the option which is suitable in the place of ? in the given series.
The value of \(\left(-\sqrt{\frac{144}{576}}\right)\times\frac{-16}{\sqrt{64}}\) is-
A boy is walking at a speed of P km/h to cover a distance of 1 km. However, due to slippery ground, his speed decreases by Q km/h (P > Q). If he takes R hours to cover the distance, then find the relation between R and Q.
\( \frac{1}{R} \)= P - Q
R + P - Q
R = P + Q
\( \frac{1}{R} \) = \( \frac{1}{p} \) + \( \frac{1}{Q} \)