A can complete a work in 31 days and B in 31 days. If both work together, in how many days will the work be completed? MCQ with Answer and Explanation

A can complete a work in 31 days and B in 31 days. If both work together, in how many days will the work be completed?

A. 20.5

B. 23.0

C. 15.5

D. 18.0

Answer: Option C

Combined rate = 1/31 + 1/31. Time = 15.5 days.

This question belongs to: Maths Time and Work

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Question #1 Report Error

A can complete a work in 10 days and B in 27 days. If they work together, the work will be completed in:

A. 12.3

B. 7.3

C. 17.3

D. 22.3

Correct Answer: Option B

Explanation:
Combined rate = 1/10 + 1/27. Required time = 7.3 days.

This question belongs to: Maths Time and Work

Question #2 Report Error

A can complete a work in 22 days and B in 20 days. If they work together, the work will be completed in:

A. 15.48

B. 25.48

C. 20.48

D. 10.48

Correct Answer: Option D

Explanation:
Combined rate = 1/22 + 1/20. Required time = 10.48 days.

This question belongs to: Maths Time and Work

Question #3 Report Error

A can complete a work in 14 days and B in 30 days. If both work together, in how many days will the work be completed?

A. 12.05

B. 17.05

C. 14.55

D. 9.55

Correct Answer: Option D

Explanation:
Combined rate = 1/14 + 1/30. Time = 9.55 days.

This question belongs to: Maths Time and Work