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

Step-by-step explanation:

Nancy can do typing job in 8 hours

i.e. in 1-hour nancy can   part of work

Together they can do that work in 5 hours

or in 1 hour part of work is done

suppose Carole takes x hours for the work

so, in 1 hour part is done

If both work together for 1 hour then we can write

step-by-step explanation:

correct answer:

i^31 = -i