If a computer finishes a job in 2 hours and another computer finishes a job in 5 hours how long will it take for them to finish together?

Question

anonymous · Answer

Are you sure? That seems really simple to do. I thought it would be more complicated :/

anonymous · Answer

Are you sure @monokerous

anonymous · Answer

it's not right 2 people will always be more efficient than 1

anonymous · Answer

Oops! Wrong interpretation. Sorry, sorry. :/

anonymous · Answer

Can someone help me please? :(

anonymous · Answer

Computer's A one hour work: $\frac{1}{2}$

Computer's B one hour work : $\frac{1}{5}$

{A + B)'s 1 hour work : $\frac{1}{2} + \frac{1}{5} \implies \frac{7}{10}$


So both will complete in : $\frac{10}{7}$ hours.

anonymous · Answer

Would i reduce that to 1 3/7 hours or just keep it as it is?

anonymous · Answer

Yes you can do that..

anonymous · Answer

Ahhh okay, thank you! :)

anonymous · Answer

Welcome dear..