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Reena, Aastha and Shloka can independent...

Reena, Aastha and Shloka can independently complete a piece of work in 6 hours, 4 hours and 12 hours respectively. If they work together, how much time will they take to complete that piece of work? `2\ hou r s` b. `5\ hou r s` c. `6\ hou r s` d. `\ hou r s` e. none of these

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