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An elephant can do a work as fast as two horses ‘A’ and ‘B’ can do it by working together. If horse ‘A’ alone can complete the work in 27 hours and horse ‘B’ in 54 hours, then find the time taken by elephant to complete the work.

A 18 hours

B 4 hours

C 12 hours

D 16 hours

E 24 hours

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