A balloon is coming down at the arate of...

A balloon is coming down at the arate of 4m/min and its angle of elevation is `45^(0)` froma point on the ground which has been reduced to `30^(0)`,after 10 min . Balloon will be onthe ground at a distance of how many meters from the observer ?

20 `sqrt(3)` m

20(3 + `sqrt(3))`m

`10(3 + sqrt(3))` m

None of these

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