Show an equation and a solution for the problem. Crane A can unload a ship in 10 hours and crane B can unload it in 14 hours. How long will it take the two cranes to unload the ship working together? Round to the nearest tenth.

Question

anonymous · Answer

I think you should take the mean right?

anonymous · Answer

Is it 12 hours?

anonymous · Answer

is it?

anonymous · Answer

I'm a bit doubtful, I think the answer should be a little less than 10 because the cranes work together right, so it should take less time.

lilg132 · Answer

crane a takes 1/10 per hour
crane b take 1/14 per hour

so together it will take 1/10 + 1/14 = 6/35 per hour

so 1/(6/35) = 35/6 = 5.8 hours (to the nearest 10th otherwise it would be 5 5/6)

mertsj · Answer

x/10 + x/14 = 1