Question 1018817
Driving X miles at 75M/H should be shown as 

{{{(X miles)(1 hour/75miles)}}} as the above will give time as a result, i.e {{{(X/75) hours}}}

The rest of the trip was

{{{(Y miles)(1 hour/60miles)}}} as the above will give time as a result, i.e {{{(X/60) hours}}}

and 

{{{((X/75) hours)+((Y/60) hours)=W}}}

multiply thru by 300

{{{((300X/75) hours)+((300Y/60) hours)=300W}}}


{{{(4X)+(5Y)=300W}}}


or 

{{{((4X)+(5Y))/300=W}}}