34.
A boat is moving away from an observation tower. It makes an angle of depression of 60° with an observer's eye when at a distance of 50 m from the tower. After 8 sec, the angle of depression becomes 30°. By assuming that it is running in still water, the approximate speed of the boat is
33 km/hr
42 km/hr
45 km/hr
50 km/hr
C.
45 km/hr
In ΔABC,
Distance = 100m, time = 8sec
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