A can complete a work in 21 days and B in 25 days. If they work together, the work will be completed in: MCQ with Answer and Explanation

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A can complete a work in 21 days and B in 25 days. If they work together, the work will be completed in:

A. 16.41

B. 21.41

C. 11.41

D. 26.41

Answer: Option C

Solution (By JKSSB Mock Tests)

Combined rate = 1/21 + 1/25. Required time = 11.41 days.

This question belongs to: Maths Time and Work

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Question #1

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A can complete a work in 22 days and B in 44 days. After working together for 5 days, what percentage of work remains?

A. 70.91

B. 68.41

C. 65.91

D. 73.41

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Correct Answer: Option C

Explanation:
Remaining work = (1 - 5*(1/22+1/44))×100 = 65.91%.

This question belongs to: Maths Time and Work

Question #2

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A can do a work in 15 days and B in 29 days. In how many days will they complete 75% of the work together?

A. 7.41

B. 9.91

C. 14.91

D. 12.41

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Correct Answer: Option A

Explanation:
Combined time for full work multiplied by 0.75 = 7.41 days.

This question belongs to: Maths Time and Work

Question #3

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A can do a work in 17 days and B in 23 days. In how many days will they complete 75% of the work together?

A. 9.83

B. 12.33

C. 14.83

D. 7.33

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Correct Answer: Option D

Explanation:
Combined time for full work multiplied by 0.75 = 7.33 days.

This question belongs to: Maths Time and Work

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