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In one hour, Ryan digs 1/5 of the hole.

In one hour, Castel digs 1/6 of the hole.

So, in one hour, together they would dig 1/5 + 1/6 = 11/30 of the hole.

So they require 30/11 hours = 2.7272... hours = 2 hours 44 minutes (approx).

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15y ago

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