Question

Please help me with this word problem. Alex can paint a room alone in 8 hours. Working together Alex and Lisa can paint the room in 3 hours. How pin would it take lisa to paint the room alone??????

Answer 1

Long not pin

Answer 2

\[1/8 + 1/x = 1/3\]
\[1/x = 1/3-1/8\]
\[1/x=8/24-3/24\]
\[1/x = 5/24\]
\[x = 24/5\]
So, it takes Lisa 4 and 4/5 hours to paint the room alone.

Answer 3

or 4.8 hours if you wish.

Answer 4

You wouldn't multiple the 24?