A boat travels 30 miles downstream in 2 hours and 30 miles upstream in 3 hours. What is the speed of the boat in still water (mph)?
- A
10
- Bcheck_circle
12.5
- C
17.5
- D
15
Explanation
Let = boat speed, = current. , . Adding: → mph.
Linear Equations in One Variable
SAT Math· difficulty 3/5
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