If Pete can paint a wall in p hours, then in one hour he can paint 1 p of the wall. It would take Penelope 3 hours longer than Pete to paint the wall, so in one hour she can paint 1 p + 3 of the wall. Add the rational expressions 1 p + 1 p + 3 to get an expression for the part of the wall Pete and Penelope would paint in one hour if they worked together.
If Pete can paint a wall in p hours, then in one hour he can paint 1 p of the wall. It would take Penelope 3 hours longer than Pete to paint the wall, so in one hour she can paint 1 p + 3 of the wall. Add the rational expressions 1 p + 1 p + 3 to get an expression for the part of the wall Pete and Penelope would paint in one hour if they worked together.
If Pete can paint a wall in p hours, then in one hour he can paint
1
p
of the wall. It would take Penelope 3 hours longer than Pete to paint the wall, so in one hour she can paint
1
p
+
3
of the wall. Add the rational expressions
1
p
+
1
p
+
3
to get an expression for the part of the wall Pete and Penelope would paint in one hour if they worked together.
A Graphical Approach to College Algebra (6th Edition)
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