Ratio and Proportion, is the book wrong

2500 m to 25 km
I get 1/100 the book gets 1/10. If the book is right please show how to get 1/10.

2500 m = 2.5 km.

Don't get confused by changing units.

= 2,500 m is to 25 km
= 2,500 m is to 25,000 m
= 2,500 is to 25,000
= 2,500/2,500 is to 25,000/2,500
= 1 is to 10

Answer: 1:10—the book is right.

The book is correct.
2500m = 2.5km
2.5km : 25km = 1 : 10

- .--

25k = 25000

2500/25000=1/10

k is thousand

25km = 25000m

2500 : 25000
= 1 : 10