A bob of m m is suspended from a string of length L, forming a pendulum. The period of this pendulum is 3.0?

A bob of m m is suspended from a string of length L, forming a pendulum. The period of this pendulum is 3.0 s. If the pendulum bob is replaced with one of m 1/3 m and the length of the pendulum is increased to 2L, what is the period of oscillation? (In s)