H=5, or five hours
Explanation
So you would create two equations
100+50h
50+60h
To find how many hours it would take for them to be equal you would put the equation equal to each other
So,
100+50h=50+60h
Solve h by combing like terms
So,
-10h=-50 then divide,
h=5
Optional, to check just substitute 5 back in both equations
100+50(5)=350
50+60(5)=350