If 1 is in K, then 2 is in K. If 1 and 2 are in K, then 3 is in K. Therefore statement (1) implies statement (2).

Now, 1+1+...(15x) = 15 and 3+3+...(5x) = 15.

So either statement alone is sufficient to answer the question.

E for sure.

Also, intuitively, x is the slowest, so x alone certainly can't takes less time than y and z combined.

due to their differing velocities they slowly gain on or fall behind the disintegrating comet until a shroud of dust surrounds the entire cometary orbit The dust cloud is caused by an accumulation of particles ejected at various velocities. If they didn't have different velocities, the particles wo...

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