madimcl madimcl

17-10-2022
Mathematics

Answered

it takes johnny and his dad 5 hours to wash the family car. kate, johnny's sister, can wash the car 3 times as fast as johnny. when johnny is not available, it takes kate and her dad 4 hours to wash the family car. how long would it take kate and johnny, all by themselves, to wash the family car?

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