Home » Aptitude » Pipes and Cistern » Question
  1. Pipe A can fill a tank in 4 hours and pipe B can fill it in 6 hours. If they are opened on alternate hours and if pipe A is opened first, in how many hours, the tank shall be full ?
    1. 4
      1
      2

    2. 3
      1
      2

    3. 3
      1
      4

    4. 4
      2
      3
Correct Option: D

On the basis of given details in question ,

Part of tank filled in first two hours =
1
+
1
=
3 + 2
=
5
461212

Part of tank filled in first 4 hours =
10
=
5
126

Remaining part = 1 –
5
=
1
66

This remaining part willl be filled by pipe A.
Time taken by pipe A =
1
× 4 =
2
hours
63

&there; Total time = 4 +
2
= 4
2
hours
33



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