Question

D=20mi, r=30 mi/h, what is the time

Answer 1

`v=(s)/(t)\\\\v=30\ mph\\\\s=20\ mi\\\\subtitute\\\\30=(20)/(t)\to(30)/(1)=(20)/(t)\ \ \ |cross\ multiply\\\\(30)(t)=(1)(20)\\\\30t=20\ \ \ \ |divide\ both\ sides\ by\ 30\\\\t=(20)/(30)\to \huge\boxed{t=(2)/(3)\ (h)}`


`1\ h=60\ min\\\\therefore\\\\(2)/(3)\ h=(2)/(3)\cdot60\ min=2\cdot20\ min=\huge\boxed{40\ min}`