Question : 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 daily, they can jointly complete the task in _____.
Option 1: 5 days
Option 2: 3 days
Option 3: 4.5 days
Option 4: 6 days
Correct Answer: 3 days
Solution :
If a person works in
One hour's work of that person is
One hour's work of A
One hour's work of B
One hour's work of both A and B = one day's work of A + one day's work of B
=
=
=
Then the whole work will be done by A and B together in 24 hours.
Working 8 hours a day both A and B can complete the work in =
Hence, the correct answer is 3 days.
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