An electric passenger train goes at 73 km/h in the direction of south east. A wind is blowing from the south at 31 km/h.

What is the direction that the smoke from the train is blowing and at what speed?

(In reply to re: Old Smokie by anoop)

Perhaps it's more difficult than I thought. I thought that once emitted the smoke would itself have no momentum, but simply become part of the air mass within the prevailing wind, going North at 31 km/h.
The smoke trail across the sky would however remain in a NW/SE line.
The smoke is more like a boat sitting in a cross tide rather than sailing against a tide.
If I'm wrong please explain your thinking.

Posted by nellie on 2003-06-21 07:29:54