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Let's solve the two parts of this problem:

### (a) A tram moved upward 9 meters per second for 36 seconds. What was the total change in the tram's elevation?

To find the total change in elevation, multiply the speed by the time:
\[
\text{Total change in elevation} = 9 \, \text{meters/second} \times 36 \, \text{seconds} = 324 \, \text{meters}.
\]
So, the total change in elevation is **324 meters**.

### (b) In a lab, a substance was cooled by 24°C over a period of 4 hours at a constant rate. What was the change in temperature each hour?

To find the rate of change per hour, divide the total change by the time:
\[
\text{Change in temperature per hour} = \frac{-24 \, \degree \text{C}}{4 \, \text{hours}} = -6 \, \degree \text{C/hour}.
\]
So, the temperature decreased by **6°C each hour**.

Let me know if you need more details or if you have any questions! Here are five related questions to further explore:

1. How would you calculate the total change in elevation if the tram moved for a different amount of time?
2. If the tram had moved downward instead of upward, how would this affect the result?
3. What would happen if the substance were heated at the same rate? How would the change per hour differ?
4. Can you express the total change in temperature over 5 hours at the same cooling rate?
5. How would you find the total change in temperature if the cooling rate varied each hour?

**Tip:** Always ensure to check units (seconds, meters, hours) when solving word problems for consistent and correct results!

A tram moved upward 9 meters per second for 36 seconds. What was the total change in the tram's elevation? In a lab, a substance was cooled by 24°C over a period of 4 hours at a constant rate. What was the change in temperature each hour?

Learn how to calculate the total change in elevation of a tram moving upward at 9 meters per second for 36 seconds, and determine the rate of temperature change when a substance is cooled by 24°C over 4 hours. This problem is ideal for students in Grades 5-7 and covers key concepts like multiplication and division.

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