Answer :

[tex]3\times5ft\ 1in=3\times(5ft+1in)=3\times5ft+3\times1in\\\\=\boxed{15ft\ 3in}\\\\1ft=12in\\therefore\ 5ft\ 1in=5ft\ 1in=5\times12in+1in=60in+1in=61in\\\\3\times5ft\ 1in=3\times61in=\boxed{183in}[/tex]

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