Analysing Technical Interrelationships - Example 4

In the diagram, three different values for the power p occur: 1, 2 and 4. According to the text, p is the lowest when the lift travels downward. Therefore in this case p = 1. Accordingly, p = 2 when the elevator stops on a floor. It follows that, when the lift travels upward, p = 4.

With this information, the lift’s activity can thus be reconstructed: At the point in time t = 0, the lift is on the third floor and it stops there for 1 minute. Then it travels downward for 1 minute. Since it travels at a speed of 30 seconds per floor, it is then on the first floor. After stopping there for 1 minute, it travels upward for 2 minutes (corresponding to four floors). Thus at the point in time t = 5, the lift is on the fifth floor. There it stops for 1.5 minutes and then travels to the sixth floor. Statement I is therefore correct. One minute later it travels 1.5 minutes (corresponding to three floors) downward and, from the point in time t = 9,5 onward it is on the third floor. Statement II is therefore also correct.

The solution to this item is therefore C.