Question

'G', 'H', and 'I', working together, can finish a task in 6 days. 'G' and 'H' can do it in 7.2 days, and 'H' and 'I' in 9 days. How long would it take for 'H' alone to complete the task?

A 15 days
B 10 days
C 12 days
D 25 days
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