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Andrew drove from A to B at 60 miles per hour. Then he realized that h

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Andrew drove from A to B at 60 miles per hour. Then he realized that h [#permalink] New post   27 Feb 2023, 02:57
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Andrew drove from A to B at 60 miles per hour. Then he realized that he forgot something at A, and drove back at 80 miles per hour. He then zipped back to B at 90 mph. What was his approximate average speed in miles per hour for the entire trip?

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Re: Andrew drove from A to B at 60 miles per hour. Then he realized that h [#permalink] New post   18 Mar 2023, 03:13
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Use a Multiple RTD chart to solve this problem. Start by selecting a Smart Number for d, such as 720 miles. (This is a common multiple of the 3 rates in the problem.) Then work backward to find the time for each trip and the total time:

Ta=720/60=12 hrs
Tb=720/80=9 hrs
Tc=720/90=8 hrs

T= 29 hrs

Average speed=2,16029≈74.5 miles per hr
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Re: Andrew drove from A to B at 60 miles per hour. Then he realized that h [#permalink]
18 Mar 2023, 03:13
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