The office jet printer can copy janet's dissertation in 16 minutes. The laser jet can copy the same document in 14 minutes. If the two machines work together, how long would it take to copy the dissertation?

Question

anonymous · Answer

Start with this: (1/16)+(1/14)=(1/x)

anonymous · Answer

I cannot remeber if i have to add or multiply

anonymous · Answer

you add, just like i have written it out

anonymous · Answer

2/30

anonymous · Answer

1/30 or 30 minutes???

anonymous · Answer

i got : 224/30 or 7.5 minutes

anonymous · Answer

are you sure you evluated the equation i gave you?

anonymous · Answer

use product /sum: (14*16)/(14+18)=224/30=7.5