Sah can paint a house in 4 hours mat use 6 hours,how long will it take both of them to paint a house together?

i wont my answer to be in detail which step by stepSah can paint a house in 4 hours mat use 6 hours,how long will it take both of them to paint a house together?
X= one house


4+6=2x


10=2x


5=X


2.5=1/2X





2.5 hoursSah can paint a house in 4 hours mat use 6 hours,how long will it take both of them to paint a house together?
2 1/2 hrs.