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I need help solving the following brain teaser. Please elaborate: The drive from Oakland to Pinewood...

I need help solving the following brain teaser. Please elaborate:

The drive from Oakland to Pinewood was a tricky one. I covered the uphill distance of 40 miles at 42 miles per hour. The return journey from Pinewood to Oakland was downhill, and I managed to drive at 56 miles per hour. What was my average speed for the entire journey?

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으+. 425 48 24 Arage red Total hme

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