Question 560647
x = time Alice works alone.
14h = time Jake works alone.
Jake: 7+3 = 10(1/14) = 10/14 = 5/7
Alice: 1/x(3)=3/x
SOLUTION: 5/7+3/x=1 (LCM = 14x)
14n(5/7+3/x)=1(14n)->10x+42=14x-> x = 21/2 = 10.5
ANSWER: It would take Alice 10h 30m to repair the transmission if she works alone.