By working 5 hours a day, A can complete a task in 8 days and working 6 hours a day, B can finish the same task in 10 days, working 8 hours a day, they can jointly complete the task in:
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. 3 days
Given that
A can complete a task in 8 days with working 5 hours a day
B can complete the same task in 10 days with working 6 hours a day
According to the question
⇒ A × 8 × 5 = B × 10 × 6
⇒ A × 40 = B × 60
⇒ A/B = 3/2
Total work = 3 × 8 × 5 = 120
Hence, they can jointly complete the task with working 8 hours a day
= 120/[(3 + 2) × 8] = 120/40 = 3 days