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For the first 5 hours of a trip, a plane averaged 120 kilometers per h
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13 Apr 2026, 10:11
13 Apr 2026, 10:11
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Question Stats:
52% (01:40) correct
47% (01:32) wrong based on 17 sessions
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For the first 5 hours of a trip, a plane averaged 120 kilometers per hour. For the remainder of the trip, the plane travelled an average speed of 180 kilometers per hour. If the average speed for the entire trip was 170 kilometers per hour, how many hours long was the entire trip?
\(\begin{aligned}
& A. 15 \\
& B. 20 \\
& C. 25 \\
& D. 30 \\
& E. 35
\end{aligned}\)
\(\begin{aligned}
& A. 15 \\
& B. 20 \\
& C. 25 \\
& D. 30 \\
& E. 35
\end{aligned}\)
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For the first 5 hours of a trip, a plane averaged 120 kilometers per h
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18 Apr 2026, 10:49
18 Apr 2026, 10:49
The problem can be solved using alligation.
attached is the diagram.
120---------------------170---------------------180
Hence , the ratio of time = 10:50 or 1:5
Since the time taken is 5 hours for the first part of the trip
the time taken for the remaining part of the trip will be = 25 hours
Total time of the trip = 25+5 = 30 hours
attached is the diagram.
120---------------------170---------------------180
Hence , the ratio of time = 10:50 or 1:5
Since the time taken is 5 hours for the first part of the trip
the time taken for the remaining part of the trip will be = 25 hours
Total time of the trip = 25+5 = 30 hours
Attachments
alligation.png [ 13.79 KiB | Viewed 542 times ]
gmatclubot
For the first 5 hours of a trip, a plane averaged 120 kilometers per h [#permalink]
18 Apr 2026, 10:49
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