Answer:
1 3/7hours
Step-by-step explanation:
If Henry can paint a room in 5 hours, then he must be able to paint 1/5 of the room in 1hour
If nick can do it in 2 hours, he must be able to paint 1/2 of the room in 1 hour
Together they can paint (1/5+1/2) of the room in 1 hour
1/5+1/2 = (2+5)/10
= 7/10
This means that they can both paint 7/10 of the room in 1hour
Hence the can use 10/7 hours to paint 1room
Time taken for them to paint the room together is 10/7 hrs = 1 3/7hr
