Village Breaks
Find a formula for T, total time for trip, as a function of d, distance walked.?
The distance between village A and village B is 15 miles. A person walks part of the way at 5 miles per hour, then jogs the rest of the way at 9 mph.
Find a formula that expresses the total amount of time for the trip, T, as a function of d, the distance walked.
Public Comments
- T=d/5+(15-d)/9
where T is in hours and d is in miles - Well, we all know that d=rt, where d is distance, r is rate, and t is time. So, solve for time. t=d/r. Since you don't know how far he walked and how far he jogged, you must use the distance for the first speed as (d) and the distance he covered jogging would be (15-d) . (You don't really know what "d" is, but you know that they add up to 15). So the total time, using the formula t=d/r would be the sum of the two parts. t=(d)/5mph +(15-d)/9mph.
