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?

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Answer 1 · 2016-09-04T18:59:32

$\frac{35}{6} hrs. = 5 hrs., 50 mnts.$ $35/6" hrs. = 5 hrs., 50 mnts."$

Crane A can unload a ship in $10$ $10$ 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 $35/6" hrs. = 5 hrs., 50 mnts."$