Unit Conversions Video Lessons

Concept

# Problem: While driving in an exotic foreign land you see a speed limit sign on a highway that reads 1.81×105 furlongs per fortnight.How many miles per hour is this? (One furlong is 1/8 large{{frac{1}{8}}}mile, and a fortnight is 14 days. A furlong originally referred to the length of a plowed furrow.)

###### FREE Expert Solution

This problem asks us to convert the strange speed units of furlongs per fortnight to miles per hour.

Whenever we convert units, the first step is to figure out what our starting and ending units are. We'll place the starting units on the left, an equals sign and ending units on the right, and some conversion factors in the middle:

The conversion factors must cancel out the starting unit and leave the ending unit. So to cancel out the starting unit in the numerator, the first conversion factor must have that same unit in the denominator.

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###### Problem Details

While driving in an exotic foreign land you see a speed limit sign on a highway that reads 1.81×105 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.)