Lilli jogs 1/2 mile in 1/10 hour, what is lilli's rate in miles per hour?

5 mph

If she jogs 1/2 miles in 1/10 hours, we need to find how much she jogs in 1 hour. Since the amount of time (1/10h) went up 10 times (10 * 1/10 = 1) then the distance must've also increased 10 times (since time and distance are proportional - the more time she jogs, the more distance she covers) and since 10 times 1/2 is 10/2, which is 5, then we can say she jogs 5 miles per hour.