Question 956277
c=rate of current
265 miles/45mph+r=185 miles/45mph-r Cross multiply.
(265 miles)(45mph-r)=(185 miles)(45mph+r)
{{{(11925mi^2/hr)-(265rmi)=(8325mi^2/hr)+185rmi}}} Add 265r mi to each side.
{{{11925Mi^2/hr)=(8325mi^2/hr)+(450rmi)}}}Subtract 8325mi^2/hr from each side.
{{{3600mi^2/hr=450rmi}}} Divide each side by 450 mi
{{{8mph=r}}}ANSWER The rate of the current was 8mph
CHECK:
265 miles/45mph+r=185 miles/45mph-r 
265 miles/45mph+8mph=185 miles/45mph-8mph
265 miles/53mph=185 miles/37 mph
5 hours=5 hours