One pipe can fill an empty cistern in 4 hours while another can drain the cistern when full in 10 hours. Both the pipes were turned on when the cistern was half-empty. How long will it take for the cistern to be full?
A] The author of the novel 'The Grapes of Wrath' is Ayn Rand. B] The author of the novel 'The Fountainhead' is John Steinbeck. C] The author of the novel 'Ancillary Justice' is Ann Leckie.
Which of the statements given above are not correct?