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**You have heard this one**: A train leaves station *A* and travels with constant velocity *v1*. A second train leaves station *B* (at a distance *d*) and travels in opposite direction with constant velocity *v2*.

**What you may have not heard** is that a fly left station *A* at the same time as the first train (and in the same direction) flying with a constant velocity *v3* ( *v3>v1* and *v3>v2* ). When the fly reached the second train it turned around
and kept flying in the opposite direction. When it reached the first train it turned around again, and so forth, until its tragit demise (when the two trains collided).

**The question is**: what distance has the fly traveled in total (summing all its going and coming back the rails) before meeting its end?

Your function should take as input the scalars *v1*, *v2*, *v3*, and *d*, and it should return *s* the total distance traveled by the fly (up to 1% error allowed)

42 correct solutions
11 incorrect solutions

Last solution submitted on Apr 28, 2015