Engineer's Puzzle

The Puzzle: Driving me MAD!

Two engineers are arguing. They'd read a puzzle in Engineering Materials magazine and were trying to convince one another that THEY were right!

The puzzle went along these lines: If you drive halfway to a town 60 miles away at a speed of 30mph (assume any time lost for acceleration or deceleration is negligible), how fast would you need to drive the rest of the way to have an average speed of 60mph over the entire trip?

You need to travel to the town directly (assume a straight line) from your half way position, and once there, you stop and turn off the engine.

Now, the two engineers 'discussing' this have very different views.

One says: "It's 90mph, you buffoon!"

While the other replies: "You idiot, it can't be done. It's impossible!"

The question is: who, if either, is right?

Justin Cunningham

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