Final answer:
Mel will take 1.5 hours to finish mowing the yard, and she needs to mow 2/3 of the yard.
Step-by-step explanation:
To calculate how long it will take Mel to finish mowing the yard, we first need to find out how much of the yard Mel needs to mow. Since Michael mows ⅓ of the yard, Mel needs to mow the remaining ⅔ of the yard. Mel can mow ¾ of the entire yard in an hour, so to find out how long it will take her to finish mowing the entire yard, we can set up a proportion:
⅔ (yard) = 1 hour
1 (yard) = x hours
By cross-multiplying, we get ⅔ * x = 1 * 1, and solving for x, we find x = 1.5 hours. Therefore, it will take Mel 1.5 hours to finish mowing the yard.
After Michael mows ⅓ of the yard, Mel needs to mow the remaining ⅔ of the yard. So, Mel needs to mow ⅔ * 1 = 2/3 of the yard.