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From a point of a bridge across a riuver...

From a point of a bridge across a riuver, the angles of depression of the banks on opposite sides of the river are `30^(@)` and `45^(@)`, respectively. IF the bridge is at a height of 10 m from the banks, then find the width of the river. (Use `sqrt3=1.73`)

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The correct Answer is:
`3(sqrt(3)+1)m`
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