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29 Sep 2011, 14:06
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A boat traveled from Port Wakefield to Port Adelaide, at an average speed of 12 miles per hour. If the return journey took exactly twice as long, what was the average speed for the round trip?
4 miles per hour
6 miles per hour
8 miles per hour
9 miles per hour
12 miles per hour
4 miles per hour
6 miles per hour
8 miles per hour
9 miles per hour
12 miles per hour
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sesamemochi
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GMAT 1: 730 Q47 V44
Schools: Haas '15 (D) Tuck '15 (D) Yale '15 (D) Wharton '15 (D) Booth '15 (A) Duke '15 (M) Anderson '15 (A)
GMAT 1: 730 Q47 V44
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29 Sep 2011, 22:13
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From Port Wakefield to Port Adelaide, the average speed is given as 12 mph. To simplify, let's say the distance between the two ports is 12 miles, and so the time spent traveling was 1 hour.
It says the return journey took twice as long, and so doubling the 1 hour gives 2 hours. Thus, it took 2 hours from Port Adelaide to Port Wakefield. To solve for the average speed of the round trip, plug everything into the rate formula:
Distance = Rate * Time
(2 * 12 miles) = Rate * (1 hour + 2 hours)
24 miles / 3 hours = Rate
8 mph = Rate
It says the return journey took twice as long, and so doubling the 1 hour gives 2 hours. Thus, it took 2 hours from Port Adelaide to Port Wakefield. To solve for the average speed of the round trip, plug everything into the rate formula:
Distance = Rate * Time
(2 * 12 miles) = Rate * (1 hour + 2 hours)
24 miles / 3 hours = Rate
8 mph = Rate
Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Quantitative Questions Forum
Still interested in this question? Check out the "Best Topics" block above for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!
