Alexandra and karissa are 261 miles apart, traveling towards each other. if karissa travels 17 mph and alexandra travels 12 mph how long until they meet?

Karissa ->. Distance = speed x time
Take the distance she travels to be x

X = 17t

Alexandra -> she would meet karissa at 261 - the x miles karissa travelled hence we get the equation

(261 - x ) = 12t

Rearrange so x is the subject

X = 261 - 12t

Next set the two equations equal to each other so you get

17t = 261 - 12t

Now solve for t

29t = 261

Divide each side by 29 To get the Value of t

t = 9 hours ( remember to take the units into account)

The correct answer would be the fourth choice

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