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1. two cars are traveling in opposite directions at the speeds of 18 mph and 22 mph respectively. if they started from the same place and same time then in how many hours will they be 200 miles apart?

so far i got:

[tex]d_1+d_2=200[/tex]

[tex]\Delta t=\frac{\Delta d}{v}[/tex]

so

[tex]\Delta t=\frac{200-d_2}{v}[/tex]

and

[tex]\Delta t=\frac{200-d_1}{v}[/tex]

can i do this?:

[tex]\frac{200-d_2}{v}=\frac{200-d_1}{v}[/tex]

if i can, then the algebra's got me stuck

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2. two cars started towards eachother at the same time from points which are 300 km apart, and met in 5 hours. if one traveled twice the speed of the other, then wat were their speeds?

so far i know i have use:

[tex]v=\frac{\Delta d}{\Delta t}[/tex]

and

[tex]v_1=x [/tex]

[tex]v_2=2x[/tex]

but then im stumped, i know i need another equation with the 300 km but i cant see it :(

thanks in advance