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Black Book Advanced Problems in MathematicsMathematicsApplication of Derivatives

Two straight roads OA and OB intersect at an angle 60^ . A car approaches O from A , where OA = 700 m at a uniform speed of 20 m/s , Simultaneously, a runner starts running from O towards B at a uniform speed of 5 m/s . The time after start when the car and the runner are closest is :

Options

  1. A10 sec
  2. B15 sec
  3. C20 sec
  4. D30 sec

Correct answer

D. 30 sec

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