A man on a cliff observes a boat at an angle of depression of `30^@` which is approaching the shore
Channel: Doubtnut
Date: 19/01/2020

A man on a cliff observes a boat at an angle of depression of `30^@` which is approaching the shore to the point immediately beneath the observer with a uniform speed . Six minutes later ; the angle of depressions of the boat is found to be `60^@`. Find the time taken by boat to reach the shore.