Let the total work = 54 units Efficiency of horse who can complete the work in 27 hours = 54/27 = 2 units/hour Efficiency of horse who can complete the work in 54 hours = 54/54 = 1 units/hour Therefore, time taken by both horses to complete the work together = 54/(2 + 1) = 18 hours Therefore, time taken by the elephant to complete the work = 18 hours
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