6th grade Q3

To solve problems involving average speed, you first need to understand the formula for average speed, which is the total distance traveled divided by the total time taken:

Example:

A car travels 150 kilometers in 3 hours and then 200 kilometers in 4 hours. What is the average speed?

First, calculate the total distance traveled by adding the two distances: $150\text{km}+200\text{km}=350\text{km}$.

Next, calculate the total time taken by adding the two time intervals: $3\text{hours}+4\text{hours}=7\text{hours}$.

Now, use the formula for average speed:

Thus, the average speed of the car over the entire journey is 50 kilometers per hour.