C is right. Is it right to deduce from the information that from:
Statement 1: x<z?
Statement 2: z>y?
I got thrown off multiplying both sides by z in Statement 2, thinking, What if z was negative, then the sign would be reversed and we don't know if z is neg or pos. BUT, robots cant have negative constant rates, now can they??
You can deduce solution from the information provided.
In this case,
1. x/z < y/z: x<y but we can't say anything about z.
2. y/z < 1: It means, y < z. but we don't know anything about x
If we consider both,
y<z & x < y => z>y>x. z is the greatest
Rate can't be negative here, since it is "rate of assembling components". But velocity of a vehicle (rate) can be negative.