The answer is D
Hope this helps!
It depends on where each train its heading is both trains destination is 600 miles apart from each other then, Train A is going 70mph so divide 600 by 70 to get 8.57 round it up to get 8.58 then multiply by 70 to get 600.4 round down to get 600. Train B is going 80mph so divide 600 by 80 to get 7.5 then multiply by 80 to get 600. The trains should be 600 mi apart by 1 hour and 14 minutes.
X - number of pens
y - number of stickers
{x + y = 5,000
{0.23x + 0.14y = 970
{x = 5,000 - y
{0.23(5,000 - y) + 0.14y = 970
{x = 5,000 - y
{1,150 - 0.23y + 0.14y = 970
{x = 5,000 - y
{-0.09y = -180
{x = 5,000 - y
{y = 2,000
{y = 2,000
{x = 3,000
He gave away <u>3,000</u> pens.