A does a work in 10 days and B does the same work in 15 days. How much part of the work is completed in 2 days if they work together?
Show answer & explanation
Correct answer: C
Explanation
A's 1-day work efficiency = 1/10
B's 1-day work efficiency = 1/15
Combined 1-day work efficiency of both = 1/10 + 1/15
= (3 + 2)/30
= 5/30
= 1/6
Therefore, work done in 2 days = 2 × 1/6= 1/3