A pendulum clock is running too fast Select the correct explanation how you can fix the problem. Select the correct explanation how you can fix the problem. To fix the problem, we want to increase the period of the pendulum. This can be done by increasing L, that is, moving the pendulum bob further away from the pivot. To fix the problem, we want to decrease the period of the pendulum. This can be done by increasing L, that is, moving the pendulum bob further away from the pivot. To fix the problem, we want to decrease the period of the pendulum. This can be done by decreasing L, that is, moving the pendulum bob closer to the pivot. To fix the problem, we want to increase the period of the pendulum. This can be done by decreasing L, that is, moving the pendulum bob closer to the pivot.