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Jack alone can carry a pail of water uphill for 40 minutes. Jill can do the same for 25 minutes. How long will it take for both of them go reach peak of the if Jill helps his friend Jack?

Sagot :

40 minutes since Jill still has to wait for jack to catch up, But with Jill's actual help they would reach the top at approximately 30 minutes.

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