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Sharp eye thesoutportschool. Thanks for spotting that. When that is corrected to use 0.04m instead of 4cm it turns out the answer becomes $0.1369 \textrm{ s}$ which rounds to $0.14 \textrm{ s}$, rather than the $0.13 \textrm{ s}$ given. I've made a note about the error in the Quick Answer.