Question 1014854
Look at it this way -


{{{50miles/2.5hours}}} is the sames as {{{20miles/hour}}}


{{{20miles/hour}}}*{{{8hours}}} = 160 miles. 

Last, note there's nothing magic about the interim step, no need to convert to {{{Xmiles/hour}}}

{{{50miles/2.5hours}}} *{{{8hours}}} = 160 miles 

Same result