An actor read aloud and recorded a certain 420-page book on several audiotapes. Was the average recording time per page

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Source: GMAT Prep

An actor read aloud and recorded a certain 420-page book on several audiotapes. Was the average recording per page less than 90 seconds?

1) Each tape was at most 40 minutes
2) The book was recorded on 15 tapes

The OA is C