3. [10] A pole has a length of 1.40 m and a mass of 400 g. A mass of 300 g is hung from the left end of the pole. A mass of 500 g is hung from the right end of the pole.How far, d, from the left end of the pole should a fulcrum be placed to balance the pole horizontally, as shown in the diagram. Be sure to take the mass of the pole into account. Give a numerical answer.

Fig: 1

Fig: 2