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?Last week I travelled from London to Leeds, which is a distance of 174 miles.

I started at 9.15am and completed the journey with an average speed of 40 miles per hour.

On the way back, in the evening, I travelled exactly the same route, starting at 5.15pm. The traffic was light and I completed the journey with an average speed of 60 miles per hour.

What was the overall average speed for round trip?

The answer is not 50 mph.

 [Ref: ZTAH] © Kevin Stone

Hint: Remember that Time = Distance ÷ Speed, and Speed = Distance ÷ Time.

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