We use cookies to personalise content and advertisements and to analyse access to our website. Furthermore, our partners for online advertising receive pseudonymised information about your use of our website. cookie policy and privacy policy.

Every 24 hours, Earth makes a full rotation around its axis. Earth's speed of rotation at the equator is 1,670 km per hour. What is the circumference of Earth's equator?

(Hint: Earth's circumference at the equator is equal to the distance that Earth rotates around the equator).

 Apr 7, 2019

Well if the circumfrence is equal to a complete rotaion than all that is required is to melitply 1,670 x 24 like this. 




\(1,670\times 24 = product\) 


\(product = circumfrance\) 



Do correct me though if I miss interpeted the problem.


 Apr 7, 2019


Sometimes it helps to cancel units.  You can cancel units the same as you cancel numbers. 


Example:  1670 km/hour x 24 hour/1 =

I just put hour over 1 to make it obvious that hour is a numerator in that term.

Cancel the hour in the denominator of km/hour and the hour in the numerator:  km/hour x hour/1 = km/1 or simply km

And it's just arithmetic to multiply the numbers 1670 x 24


That's going to come to approximately 40,000 because 24 is almost (100 x 1/4) and (1/4 x 1670) is close to 400

You should multiply them on out formally and get the exact answer.


 Apr 8, 2019

34 Online Users