Question

Nancy can do a typing job in 8 hours. When Carole helps her, they can do the job together in 5 hours. How many hours would it take Carole to do the job alone?

i got that carole can fo it in 13 hours and 20 minutes alone is this right?

Answer 1

correct,
how did you get that?
I am more interested in your method and thinking than the actual answer.

Answer 2

1/8 + 1/x = 1/5

x+8/8x = 1/5

5x+ 40 = 8x 3x = 40

x = 40/3 = 13hr 20min.

Answer 3

Thanks