Student A can paint 1 room in 4 hours. Student B can paint the same room in 3 hours. How long will it take them if they are working together to paint the room? (Round answer to nearest hundredth if necessary)
A- 1.71 hours
B- 12 hours
C- 3.5 hours
D- 0.14 hours

Question

Student A can paint 1 room in 4 hours. Student B can paint the same room in 3 hours. How long will it take them if they are working together to paint the room? (Round answer to nearest hundredth if necessary) 
A- 1.71 hours
B- 12 hours
C- 3.5 hours 
D- 0.14 hours

anonymous · Answer

Problems like these are always on recruitment tests :)

anonymous · Answer

In 1 hr , A does 25% of work and B does 33% which makes it 58% total work.

From the options , 1.71 hrs looks the best bet

anonymous · Answer

since less than 2 hrs is needed overall.