JEE Main 2023 Physics question

When two resistances and connected in series and introduced into the left gap of a meter bridge and a resistance of 10 is introduced into the right gap, a null point is found at 60 cm from left side. When and are connected in parallel and introduced into the left gap, a resistance of 3 is introduced into the right gap to get null point at 40 cm from left end. The product of is