1.

If A can complete a work in 80 min and B can complete the same work in 40 min. Then in how much time A and B together can complete the work.1. 26 min 20 seconds2. 26 min 40 seconds3. 25 min 40 seconds4. 28 min 40 seconds

Answer» Correct Answer - Option 2 : 26 min 40 seconds

Given:

A can complete a work in 80 min and B can complete the same work in 40 min. 

Calculation:

 The efficiency of A = 1/80 per minute

 The efficiency of B = 1/40 per minute

 Time taken by both A, B to complete the work = ( 1/A + 1/B )

 ( 1/80 + 1/40 ) = ( 1 + 2 )/80 = 3/80

⇒ Time Taken = 80/3 

∴ Time Taken = 26 minutes 40 seconds



Discussion

No Comment Found

Related InterviewSolutions