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Q:

A person from the top of a hill observes a vehicle moving towards him at a uniform speed. It takes 10 minutes for the angle of depression to change from 45 ° to 60 °. After this the time required by the vehicle to reach the bottom of the hill is 

  • 1
    13 min 40 sec
  • 2
    14 min 24 sec
  • 3
    12 min 20 sec
  • 4
    13 min
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Answer : 1. "13 min 40 sec "

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