Multiple choice

A tap can fill a tank in 6 hours. After half the tank is filled, three more similar taps are opened. What is the total time taken to fill the tank?

  1. 3 hrs 15 minute

  2. 3 hrs 45 minute

  3. 4 hrs

  4. 4 hrs 15 min
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Time taken by one tap to fill half the tank = 3 hrs Part filled by four tapes in 1 hour = ( 4 ´ 1/6 ) = 2/3 Remaining Part = ( 1 - ½ ) = ½ 2/3 : ½ : : 1 : x , x = 3 hrs 45 min

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