# north

## 25 Two cars that may collide at 12:30 PM

**Problem 25**

One city *E*, is 20 miles north and 20 miles east of another city, *F*. At noon a car starts south from *E* at 40 mi/hr, at 12:10 PM, another car starts east from *F* at 60 mi/hr. Find the rate at which the cars approach each other between 12:10 PM and 12:30 PM. What happens at 12:30 PM?

## 22-24 One car from a city starts north, another car from nearby city starts east

## 11-12 Two trains; one going to east, and the other is heading north

**Problem 11**

A train starting at noon, travels north at 40 miles per hour. Another train starting from the same point at 2 PM travels east at 50 miles per hour. Find, to the nearest mile per hour, how fast the two trains are separating at 3 PM.