Justin ran 15 miles at a constant rate in 2.5 hours. The next day, he ran at a rate that was 1 mph slower. What was Justin’s rate the second day?
A. 2.5 mph
B. 4 mph
C. 5 mph
D. 6.5 mph
To find Justin's rate the second day, we can use the formula:
Rate = Distance / Time
We know that Justin ran 15 miles at a constant rate in 2.5 hours the first day. So his rate the first day can be calculated as:
Rate_day1 = 15 miles / 2.5 hours
Rate_day1 = 6 mph
Since the second day, Justin ran 1 mph slower, we can subtract 1 mph from the rate of the first day to find his rate the second day:
Rate_day2 = Rate_day1 - 1 mph
Rate_day2 = 6 mph - 1 mph
Rate_day2 = 5 mph
Therefore, Justin's rate the second day was 5 mph. Hence, the answer is option C.
It is a quiz.
"slower" means you subtract, right?
so, since speed = distance/time,
15/2.5 - 1 = ____