Question 25 of 70

When two resistance ${R}_{1}$ and ${R}_{2}$ connected in series and introduced into the left gap of a meter bridge and a resistance of $10\Omega$ is introduced into the right gap, a null point is found at $60cm$ from left side. When ${R}_{1}$ and ${R}_{2}$ are connected in parallel and introduced into the left gap, a resistance of $3\Omega$ is introduced into the right-gap to get null point at $40cm$ from left end. The product of ${R}_{1}{R}_{2}$ is ______ ${\Omega }^{2}$