Szymon and Chris fly their balloon around the earth in 80 days. Taking the radius of the earth to be 6400 km, calculate their average speed in m/s.

I did answered all the homework questions but I didn't know how to do this one?

circumference = 2 pi r

= 2 pi (640,0000)

time = 80 d * 24 h/d * 3600 seconds/h

so
speed = circumference / time

To calculate the average speed, we need to know the distance covered and the time taken. In this case, we are given that Szymon and Chris fly their balloon around the Earth in 80 days.

To find the distance they covered, we can calculate the circumference of the Earth. The formula to calculate the circumference of a circle is C = 2πr, where C represents the circumference and r represents the radius.

Given that the radius of the Earth is 6400 km, we can substitute this value into the formula:

C = 2π × 6400 km

Now let's convert the distance from kilometers to meters, as the average speed is typically measured in meters per second (m/s).

1 kilometer = 1000 meters

This means that the distance around the Earth is:

C = 2π × 6400 km × 1000 m/km

To calculate the average speed, we need to divide the distance traveled by the time taken. In this case, the time is given as 80 days.

Now, let's calculate the average speed:

Average Speed = Distance / Time

First, let's convert 80 days into seconds:

1 day = 24 hours
1 hour = 60 minutes
1 minute = 60 seconds

So, 80 days = 80 days × 24 hours/day × 60 minutes/hour × 60 seconds/minute

Now, substitute the calculated values in the formula:

Average Speed = (2π × 6400 km × 1000 m/km) / (80 days × 24 hours/day × 60 minutes/hour × 60 seconds/minute)

Perform the calculations to find the average speed in m/s.