Answer:
Step-by-step explanation:
There is no unit on this 3 3/4 figure, so my assumption here is that velocity is given in furlongs per fortnight.
A furlong is one eighth of a mile, so Alex is walking 18 furlongs.
18 furlongs / 3.75 furlongs per fortnight gives us 4.8 fortnights. A fortnight is 2 weeks, so this figure comes to 67 days, 4 hours, and 48 minutes, if Alex does not stop for rest.