1. How many miles is a league?
2. How many furlongs is a mile?
3. How many yards is a furlong?
4. How many feet is a yard?
5. How many inches is a foot?
6. How many yards is a fathom?
7. How many chains is a furlong?
8. How many yards is a chain?
9. How many yards is a rod?
10. How many miles does light travel per second?