How many miles per hour is this? (one furlong is 18 mile, and a fortnight is 14 days. a furlong originally referred to the length of a plowed furrow.) ?

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