MathematicsIf 6 oil tankers can be filled by a pipe in 4( 1 2 )   hours, how long does the pipe take to fill 4 such oil tankers?

If 6 oil tankers can be filled by a pipe in 4( 1 2 )   hours, how long does the pipe take to fill 4 such oil tankers?


  1. A
    3 hours
  2. B
    4 hours
  3. C
    5 hours
  4. D
    2 hours 

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    Solution:

    Given that 6 oil tankers can be filled by a pipe in 4 1 2   hours.
    Multiply the 4 oil tankers to the time required by 1   oil tanker.
    6   oil tankers can be filled by a pipe.
    4 1 2 = 9 2  
    1   oil tanker can be filled by a pipe in 9 2×6   hours.
    4   oil tankers can be filled by a pipe.
    9 2×6 ×4 18 6 3hours  
    Therefore, 4 oil tankers can be filled within 3 hours by the pipe.
    Hence option 1 is the answer.
     
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