Answer:
Approximately 53 mins
Explanation:
Yard mowed by Michael = ⅓ of the yard
Yard mowed by Mel = 1 - ⅓ =

Rate at which Mel can mow a yard = ¾ of the yard in 1 hour
That is, it would take 1 hr to mow ¾ of the yard.
If ¾ yard requires 1 hr, then,
⅔ yard would require x hr
Thus:
x*¾ = 1*⅔

Cross multiply


Divide both sides by 9

It would take Mel
to finish mowing her part, which is approximately 53 mins.
.