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?

1 Answer
Sep 4, 2016

Answer:

#35/6" hrs. = 5 hrs., 50 mnts."#

Explanation:

Crane A can unload a ship in #10# hrs.

#:." Crane A can unload "1/10" of the ship in "1# hr.

Similarly, Crane B can unload #1/14" of the ship in "1# hr.

Hence, both the cranes together can unload

#1/10+1/14=12/70=6/35# of the ship in #1# hr.

Therefore, both the cranes work together, the ship will be completely unloaded in #35/6" hrs. = 5 hrs., 50 mnts."#