Answer:
[tex]\dfrac{5}{6}[/tex] hour or 50 minutes
Step-by-step explanation:
Last week:
Claire mowed 5 lawns
She mowed each lawn in [tex]\frac{7}{12}[/tex] hour.
She spent
[tex]5\cdot \dfrac{7}{12}=\dfrac{35}{12}=2\dfrac{11}{12}[/tex]
hours to mow 5 lawns.
This week:
Claire mowed 5 lawns
She mowed each lawn in [tex]\frac{5}{12}[/tex] hour.
She spent
[tex]5\cdot \dfrac{5}{12}=\dfrac{25}{12}=2\dfrac{1}{12}[/tex]
hours to mow 5 lawns.
Difference:
[tex]2\dfrac{11}{12}-2\dfrac{1}{12}=\dfrac{11}{12}-\dfrac{1}{12}=\dfrac{10}{12}=\dfrac{5}{6}[/tex]
hour or 50 minutes.
