From the peak of a hill which is 300m high, the angle of depression of twosides of a bridge lying on a ground are $45^{0}$ and $30^{0}$ (both ends of the bridge are on the same side of the hill).Then the length of the bridge is

From the peak of a hill which is 300m high, the angle of depression of twosides of a bridge lying on a ground are $45^{0}$ and $30^{0}$ (both ends of the bridge are on the same side of the hill).Then the length of the bridge is
1). $300(\sqrt{3}-1)$ m
2). $300(\sqrt{3}+1)$ m
3). $300\sqrt{3}$ m
4). $\frac{300}{\sqrt{3}}$ m

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