the complete question is
While driving in an exotic foreign land you see a speed limit sign on a highway that reads 180,000 furlongs per fortnight. How many miles per hour is this? (One furlong is 1/8 mile, and a fortnight is 14 days. A furlong originally referred to the length of a plowed furrow.)
Step 1
convert (furlongs per fortnight) to (miles per fortnight)
180,000 furlongs per fortnight=180,000*(1/8)=22,500 miles per fortnight
Step 2
convert miles per fortnight to miles per hour
1 day=24 hour
14 day=24*14=336 hours
22,500 miles per fortnight=22,500/336=66.96 mph
therefore
the answer is
66.96 mph