As given by the question
There are given 1.5 km every day.
Now,
If 1.5 km walk every day, then in the 7 days is:
[tex]1.5\times7=10.5\text{ km}[/tex]Then,
To convert km into meters, multiply the length value by 1000
So,
[tex]10.5\times1000=10500[/tex]Hence, 10500 meters walk in the 7 days.