A, B and C together can fill a tank in 6 hours. After 2 hr. pipe C will be closed and A, B together fill the remaining tank in 7 hours. In what time C can fill the empty tank?
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A, B and C together can fill a tank in 6 hours. After 2 hr. pipe C will be closed and A, B together fill the remaining tank in 7 hours. In what time C can fill the empty tank?