SOLUTION:
Jamie drove 15 miles from his house to get to school. He drove the first 8 miles at 45 mph, and the next 7 miles at 30 mph. Would the trip take more, less, or the same amount of
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Jamie drove 15 miles from his house to get to school. He drove the first 8 miles at 45 mph, and the next 7 miles at 30 mph. Would the trip take more, less, or the same amount of
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Question 715747:
Jamie drove 15 miles from his house to get to school. He drove the first 8 miles at 45 mph, and the next 7 miles at 30 mph. Would the trip take more, less, or the same amount of time if he drove the entire 15 miles at a steady 40 mph? Answer by checkley79(3341) (Show Source):
You can put this solution on YOUR website! D=RT
15=(8/15*45+7/15*30)T
15=(8*3+7*2)T
15=(24+14)T
15=38T
T=15/38
T=.395 HOURS.
15=40T
T=15/40
T=.375 HOURS. LESS TIME @ 40MPH.
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