Mark M. answered • 07/04/16

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In h hours Jan weeds h/2 of the lawn.

In h hours husband weeks h/1.5 of the lawn

h/2 + h/1.5 = 1

1.5h + 2h = 3 multiply both sides by LCD, 3

3.5 h = 3 combine like terms

h = 3 / 3.5 divide both sides by 3.5

h = 6 / 7 divide numerator/denominator by 0.5

They take six-sevenths of an hour (about 51 minutes) to weed the lawn.