Question:

It takes 30 minutes to empty a half-full tank by draining it at a constant rate. It is decided to simultaneously pump water into the half-full tank while draining it. What is the rate at which water has to be pumped in so that it gets filled in 10 minutes ?

  • 4 times the draining rate
  • 3 times the draining rate
  • 2.5 times the draining rate
  • 2 times the draining rate
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The Correct Option is A

Solution and Explanation

The correct option is (A) : 4 times the draining rate.
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