91Ó°ÊÓ

Here,

Furlong and fortnight are the units used in olded days to measure the distance and the time travelled by a person respectively.

According to the data one furlong was considered approximately 1/8thmiles.

Similarly 1 fortnight is considered almost equal to two weeks.

Given data:

Speed limit in furlongs/fortnight = 180,000 furlongs/fortnight

Other necessaryconversions given

$1furlong=\frac{1}{8}=miles=0.125mile$

$1fornight=14days$

We know that 1 day contains 24 hour.

Hence 14 days contain =24 x 14 hours =336 hour.

We need to convert furlong into mile so we need to multiply the value with 0.125 to convert it into hours. Similarly to convert fortnight into hours we need to divide it with 14 days (two week contains) and also by 24 because each day contain 24 hours.

$$\begin{gathered} =\left(180000\frac{furlongs}{fornight}\right)×\left(\frac{0.125miles}{1forlong}\right)×\left(\frac{1fornight}{14days}\right)×\left(\frac{1day}{24h}\right) \\ =67mile/hour \end{gathered}$$

It is therefor concluded that the speed limit is 67 miles/hour.