Explanation: divide the track 500+500, first is V1, second is V2, entire is 2v1, so average 2v1. Now (V1+V2)/2=2V1, solving this, V2=2*2v1-v1=3v1. That's it.
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Explanation: divide the track 500+500, first is V1, second is V2, entire is 2v1, so average 2v1. Now (V1+V2)/2=2V1, solving this, V2=2*2v1-v1=3v1. That's it.
But would it be little bit too easy for 5 SBD ^^?