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David is visiting his aunt for the Thanksgiving weekend. He drove 60% of the trip at 40 mph and the rest at ‘x’ mph. The average speed for the entire trip is 50 mph. What is x? …

David is visiting his aunt for the Thanksgiving weekend. He drove 60% of the trip at 40 mph and the rest at ‘x’ mph. The average speed for the entire trip is 50 mph. What is x? …
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David is visiting his aunt for the Thanksgiving weekend. He drove 60% of the trip at 40 mph and the rest at ‘x’ mph. The average speed for the entire trip is 50 mph. What is x? A. 60 mph B. 70 mph C. 75 mph D. 80 mph E. 90 mph F. 100 mph

User Pydsigner
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2 Answers

1 vote
The answer is D.80 mph !!!
User Vic
by
8.0k points
4 votes

Answer:

D. 80 mph

Explanation:

d- distance

  • d/50= 0.6d/40+0.4d/x
  • 1/50= 0.3/20+0.4/x
  • 0.4/x= 0.02- 0.015
  • x= 0.4/0.005
  • x= 80 mph
User Ahmad Saleh
by
8.9k points
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