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hjeffrey168
24.07.2020 •
Mathematics
Two cars leave an intersection at the same time. One drives east while the other travels south at 15 miles per hour faster than the other. After 3 hours, the cars are 225 miles apart. How fast is the southbound car driving?
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Ответ:
60 mph
Step-by-step explanation:
Let 'S' be the velocity of the southbound car and 'E' be the velocity of the eastbound car. The distances traveled by each car are:
The distance between both cars is given by:
Solving the quadratic equation for the velocity of the eastbound car:
The velocity of the southbound car is:
The southbound car is driving at 60 mph.
Ответ: