Question 273606
James and Javier each go on separate trips with Javier driving twice as fast as James. James travels for 3 hours while Javier travels for 2 hours. They drive a total of 280 miles. How fast does Javier drive?

Let james drive at speed x

Javier travels 2x


James travels 3 hours so distance traveled by him is 3x

Javier travels for 2 hours so he travels 2*2x miles = 4x 

4x+3x=280

7x=280
x=40 which is james speed.

Javier's speed =80 mph