Answer:
She spends 0.98 min, that is, aprroximately 1 min waiting at traffic lights.
Step-by-step explanation:
The length of the drive is 6 8/9 minutes
As a fraction, this is:
[tex]6 + \frac{8}{9} = \frac{62}{9}[/tex]
She spends 1/7 of this time waiting at traffic lights.
This is 1/7 of 62/9. So
Time waiting:
[tex]t = \frac{62}{9} \times \frac{1}{7} = \frac{62}{63} = 0.98[/tex]
She spends 0.98 min, that is, aprroximately 1 min waiting at traffic lights.
