A can complete a work in 21 days and B in 31 days. If both work together, in how many days will the work be completed? MCQ with Answer and Explanation

Question

Share Report Error

A can complete a work in 21 days and B in 31 days. If both work together, in how many days will the work be completed?

A. 20.02

B. 15.02

C. 12.52

D. 17.52

Answer: Option C

Solution (By JKSSB Mock Tests)

Combined rate = 1/21 + 1/31. Time = 12.52 days.

This question belongs to: Maths Time and Work

Request complete Subject PDF

Discuss this Question (0)

No comments yet. Be the first to start the discussion!

Practice More Time and Work Questions

Question #1

Share Report

11 men can complete a work in 18 days. If 16 men work at the same rate, the work will be completed in:

A. 17.38

B. 12.38

C. 27.38

D. 22.38

View Answer & Solution Discuss

Get Complete Subject PDF for Maths

Correct Answer: Option B

Explanation:
Total work = 198 man-days. Time = 198/16 = 12.38 days.

This question belongs to: Maths Time and Work

Question #2

Share Report

A can complete a work in 19 days and B in 41 days. If both work together, in how many days will the work be completed?

A. 15.48

B. 12.98

C. 17.98

D. 20.48

View Answer & Solution Discuss

Get Complete Subject PDF for Maths

Correct Answer: Option B

Explanation:
Combined rate = 1/19 + 1/41. Time = 12.98 days.

This question belongs to: Maths Time and Work

Question #3

Share Report

A can do a work in 14 days and B in 24 days. They work together for 5 days. What percentage of work remains?

A. 58.45

B. 53.45

C. 48.45

D. 43.45

View Answer & Solution Discuss

Get Complete Subject PDF for Maths

Correct Answer: Option D

Explanation:
Remaining work = (1 - 5*(1/14+1/24)) ×100 = 43.45%.

This question belongs to: Maths Time and Work

Explore All Time and Work MCQs