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2 years ago

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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

2 answers:

Brut [27]2 years ago

4 0

Answer:

D. 80 mph

Step-by-step 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

malfutka [58]2 years ago

4 0

The answer is D.80 mph !!!

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