College of Admission Tests Multan

Work and Rate Problems

Solve the question of and select the option from the choices A through D/E. Check your Answer and view the explanation.

Question: 3

A does half as much work as B in three-fourth of the time. If together they take 18 days to complete the work, how much time shall B take to do it
  • 40 days
  • 35 days
  • 30 days
  • 25 days

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Correct Answer: C

None

Suppose B takes x days to do the work.

As per question A will take

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(A+B)s 1 days work= 1/18

1/x + 2/3x = 1/18 or x = 30 days