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On a long drive, a truck covered P percent of the total

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by AAPL » Wed Dec 18, 2019 5:35 pm
Magoosh

On a long drive, a truck covered P percent of the total distance on a local road, where it drove only 30 mph. The rest of the trip, it traveled at 50 mph. In terms of P, which of the following represents the average velocity of the entire trip?

A. P-10
B. 50 - P/5
C. (2P+1000)/40
D. 10000/(P+200)
E. 15000/(2P+300)

OA E
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Source: — Problem Solving |

by Scott@TargetTestPrep » Wed Jan 01, 2020 6:47 pm
AAPL wrote:Magoosh

On a long drive, a truck covered P percent of the total distance on a local road, where it drove only 30 mph. The rest of the trip, it traveled at 50 mph. In terms of P, which of the following represents the average velocity of the entire trip?

A. P-10
B. 50 - P/5
C. (2P+1000)/40
D. 10000/(P+200)
E. 15000/(2P+300)

OA E
We can let the total distance = 100 miles. Since average rate = (total distance)/(total time), we have:

100 / (P/30 + (100 - P)/50)

100 / (5P/150 + (300 - 3P)/150)

100 / ((300 + 2P)/150)

15000 / (300 + 2P)

Answer: E

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