Monthly puzzle

After the new freeway was built, I could no longer use the gravel road that ran due north from my house to get to my favourite lake. Instead, I now either have to go due east to Underville to use the underpass there, and then straight on to the lake, or else due west to Overtown, over the overpass there and then straight on to the lake.

Driving to the lake via Underville is twice as far as it was on the old gravel road. The other way, via Overtown, is three times as far as it was going straight north. The distance between Underville and Overtown is 39 km longer than it was from my house to the lake on the old gravel road.

How far was it from my house straight north to the lake?

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Last updated: August 19, 2010

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