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An aero plane is flying horizontally at an altitude of 3000 ft directly over an observer. If it is flying witha speed of 300 ft/sec, the rate at which it is moving away from the observer when it is at 5000 ft away from the observer is _____


  1. 240 ft/sec

  2. 360 ft/sec

  3. 120 ft/sec

  4. 225 ft/sec


Solution

The correct option is A

240 ft/sec


y2=x2+30002ydydt=xdxdtdydt=40005000300=240 ft/sec

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