Question 954431
d=distance
{{{d/(20mph+5mph)+d/(20mph-5mph)=4hrs}}}
{{{d/25mph+d/15mph=4hrs}}}
{{{d(1/25mph+1/15mph)=4hrs}}}
{{{d(3/75mph+5/75mh)=4hrs}}}
{{{d(8/75mph)=4hrs}}}
{{{d=4hrs(75mph/8)}}}={{{(300/8)miles=37.5miles}}} ANSWER: Ray could go 37.5 miles.
CHECK:
{{{37.5mi/25mph+37.5mi/15mph=4hrs}}}
{{{1.5hrs+2.5hrs=4hrs}}}
{{{4hrs=4hrs}}}