Answer
6mph, 3 mph
Work Step by Step
trail is 36 miles long, takes 4 hours
$x=2y$
$(x+y)*4=36$
$4x+4y=36$
$4*(2y)+4y=36$
$8y+4y=36$
$12y=36$
$12y/12=36/12$
$y=3$
$x=2y$
$x=2*3$
$x=6$
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