Answer:
5. 4 hour 17 minutes
Explanation:
Lilith can complete work in 6 hours so every hour she will complete 1/6 of the work
Janice can complete work in “x” hours so every hour she will complete 1/x of the work.
so if they both work together in 2.5 hours
Lilith will complete 2.5(1/6) work
Janice will complete 2.5(1/x) work
so 2.5(1/6) + 2.5(1/x) = 1
=> 1/6 + 1/x = 0.4
=> 1/x = 0.4 - 1/6
=> 1/x = 2.4/6 - 1/6
=> 1/x = 1.4/6
=> 1(6) = 1.4(x)
=> x = 6/1.4 = 5.6/1.4 + 0.4/1.4 = 4 + 0.4/1.4 hours
since 0.4/14 hour = (0.4/14)60 = 17.1 or 17 minutes
so x = 4 hour + 17 minutes
I hope this will help to solve the other problems