Is the number of seconds required to travel d1 feet at r1 feet per second greater than the number of seconds required to travel d2 feet at r2 feet per second?
(1) d1 is 30 greater than d2.
(2) r1 is 30 greater than r2.
Statements 1 and 2 ALONE are surely not sufficient to answer the question.
However i think BOTH statements TOGETHER are sufficient
From Statement 1:
(d2 + 30)/r1
From Statement 2:
d1 / (r2 + 30)
From Statement 1 and 2:
(d2 + 30) / (r2 + 30)
Now if anyone has done Manhattan, refer Page 28 FDP which says, ''increasing BOTH the numerator and the denominator by THE SAME VALUE brings the fraction closer to 1."
It means it increases the original value, right.
So if i have to decide which is greater, (1) (d2 + 30) / (r2 + 30) or (2) d2 / r2, obviously it has to be (1).
OG explaination says Statement (1) and (2) TOGETHER are not sufficient.
What's yours view guys??