Answer
6/7 hours
Work Step by Step
Jan takes 2 hours, husband takes 1.5 hours
In 1 hour, Jan can do 1/2 the garden, and the husband can do 1/1.5 the garden
$1/2 + 1/1.5 = 1/x$
$1/2 + 1/1.5*2/2 = 1/x$
$1/2 + 2/3 = 1/x$
$1/2*3/3 + 2/3 *2/2 = 1/x$
$3/6 + 4/6 = 1/x$
$7/6 = 1/x$
$7/6 * 6x/7 = 1/x * 6x/7$
$x = 6/7$ hours
