Report threads that break rules, are offensive, or contain fighting. Staff may not be aware of the forum abuse, and cannot do anything about it unless you tell us about it. click to
report forum abuse »
If one of the comments is offensive, please report the comment instead (there is a link in each comment to report it).
A thread where you can befuddle everyone and whoever correctly gets the answer then places their puzzle to solve.
Two Trains
2 trains are on a track heading towards each other.
They are 100km appart, and travelling at 50km/hr.
There is a fly just in front of one train, and it gets scared and buzzes away down the track at 75km/hr.
When it reaches the other train, it reverses its direction and heads back up the track.
Q\ How many kilometres does the fly travel before the trains collide?