A cross-country runner jogs at a rate of 15 feet per second. If she runs 300 feet from A t...

A cross-country runner jogs at a rate of 15 feet per second. If she runs 300 feet from A to B, 450 feet from B to C, and then 600 feet from C back to A, how long will it take her to return to point A? See figure for.

In the figure, the 15-mile road from A to C is under construction. A detour from A to B of 5 miles and then from B to C of 13 miles must be taken. How much farther is the “detour” from A to C than the road from A to C?