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Capthan
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In a stream with a current of 5 kilometers per hour a boat 21 Mar 2008, 06:18
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In a stream with a current of 5 kilometers per hour a boat made a trip downstream from point A to a point B and then back upstream from point B to point A. Measured in still water, the boat’s average speed for the trip was 15 kilometers per hour. Measured in the stream, what was the boat’s average speed for the trip in kilometers per hour?
16 2/3
15
14 ½
13 1/3
13
Please explain your answer.
Optional: time you spend on this question



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prov
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In a stream with a current of 5 kilometers per hour a boat 21 Mar 2008, 06:50
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Capthan
In a stream with a current of 5 kilometers per hour a boat made a trip downstream from point A to a point B and then back upstream from point B to point A. Measured in still water, the boat’s average speed for the trip was 15 kilometers per hour. Measured in the stream, what was the boat’s average speed for the trip in kilometers per hour?
16 2/3
15
14 ½
13 1/3
13
Please explain your answer.
Optional: time you spend on this question
Show more


Let distance from A to B = S
downstream speed = 15+5=20 .... time used = S/20
upstream speed = 15-5=10 .... time used = S/10

average speed = total distance/total time spend
=2S / (3S/20)
= 40/3
= 13 1/3


edit for typo



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!