A can paint seven chairs in an hour and B can paint four chairs in an hour. Determine how much time they will require to paint 55 chairs when they work together.
Show answer & explanation
Correct answer: B
Explanation
The correct answer is Option 2 i.e. 5 hours
A can paint 7 chairs in an hour.
B can paint 4 chairs in an hour.
Total chairs painted by A and B in an hour = 7 + 4 = 11 chairs
Time = Total work/Combined rate
The total work = 55 chairs
Therefore, the time required = 55/11 = 5 hour