Answer:
The correct answer is 24 minutes
Step-by-step explanation:
Given.
Trent deliver in 40 minutes
Lois deliver in 60 minutes
We can calculate this problem in the next way:
(1/40 + 1/60) x = 1
first we have to expand the fractions first with 3 and the other with 2
and get
(3/120 + 2/120) x = 1 => (5 / 120) x = 1 => x = 1 : (5 / 120) = 1 · 120/5 = 24
x = 24 minutes
God with you!!!