A can paint 5 chairs in an hour, and B can paint 3 chairs in an hour. Determine how much time they will require to paint 40 chairs when they work together.
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. 5 hours.
A can paint 5 chairs in an hour,
B can paint 3 chairs in an hour
So, A and B can paint the chairs in 2 hours = 5 + 3 = 8
So, total time taken to paint 40 chairs = 40/8 = 5 hours