Question

It takes mike 18 minutes to finish reading 4 pages of a book how long does it take for him to finsh reading 30 pages

Answer 1

total 30 pages in a book,
if it takes 18 minutes for every 4 pages there will be 7 cycles plus 2 pages.
7 cycles =
$7 \times 4 = 28 \ + 2 \: pages \:$
hence
$7 \times 18+ 2 \times 9 = 135 \: minutes$