Who's up for two difficult math questions??

eobaggs
Tue, 23 Nov 2010 14:09:20 +0000

Both have a difficulty rating of 5, beware.

First one: ImageShack - Best place for all of your image hosting and image sharing needs;

Second one: A car traveled 10 miles at an average speed of 20 miles per hour and then traveled the next 10 miles at an average speed of 40 miles per hour. What was the average speed, in miles, per hour, of the car for the 20 miles??

I used a formula for the second one and got the right answer, but is this the only way to do it? I used xiggi’s method: (2speed1speed2)/(speed1+speed2)

Thanks! And I know the answers, I just need explanations. Thanks again!