Jay can paint a house in 5 hours and david can paint a house in 3 hours. how long will it take them to paint a house if they work together

Since they are working together, you need to add the 5 hours and 3 hours together which if 8 hours.

Then you need to divide the 8 hours to 2.

The answer is 4 hours if Jay and David paint a house together.

5  *  3
=  8

8/2
=4

I hope my answer helped you.
Have a great day!

Jay can paint 1 house in 5 hours
jay can paint 1/5 house in 1 hour

david can paint 1 house in 3 hours
david can paint 1/3 house in 1 hour

ok, so
in 1 hour, they can paint 1/5+1/3 house
1/5+1/3=3/15+5/15=8/15 house

so
8/15 house per hour times x hours=1 house
times both sides by 15/8
x=15/8 hours
x=1 and 7/8 hour

it will take 1 and 7/8 hour or 1.875 hour or 1 hour and 52.5mins