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#36130

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medium

120 sec

A car travels at a constant speed of $s$ miles per hour for 3 hours. Then, it increases its speed by 10 miles per hour and travels for another 2 hours. The total distance $D$ , in miles, traveled by the car is given by the expression $D = 3 s + 2 (s + 10)$ . If the total distance traveled is 300 miles, what is the speed of the car, in miles per hour, during the last 2 hours of its journey?

• Up to 5 characters (6 if negative). Only numbers, decimal (.), fraction (/), negative (-).
• Fractions must be in lowest terms.
• Mixed numbers must be converted to improper fractions.