question stem:
d1/r1 > d2/r2
statement (1)
d1 = 30+d2
we dont know anything about the rate
we can have both the cases. Insufficient.
statement (2)
r1=30+r2
dont know anything about the distance
we can have both the cases. Insufficient.
combining (1) & (2)
30+d2/30+r2 > d2/r2
d2=5, r2=2
36/32 > 6/2
9/8 > 3
1.1 > 3. Insufficient.
Thus, E.
OA?
Distance
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Source: Beat The GMAT — Data Sufficiency |
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dally_gmat
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Statement a amd b cannot answer independently...
Combinig both:
let d2 and r2 = 100
therefore d1 and r1 = 130
So t1 = t2= 1
now lets take d2 = 100, r2 = 1
so d1 = 130 , r1 = 31
implies t1 = 4and t 2 = 100
So we cannot say if its greater or equal..
hence answer E
What is OA?
Combinig both:
let d2 and r2 = 100
therefore d1 and r1 = 130
So t1 = t2= 1
now lets take d2 = 100, r2 = 1
so d1 = 130 , r1 = 31
implies t1 = 4and t 2 = 100
So we cannot say if its greater or equal..
hence answer E
What is OA?
beater wrote: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.
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maihuna
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I solved it this way:beater wrote: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.
Stem: is d1/r1 > d2/r2
given: d1 = d2+30
r1=r2+30
so d2+30/r2+30 > d2/r2
since r1 r2 positive
r2*d2 + 30r2 > r2*d2 + 30 d2
or r2>d2
so using the two info it asks whether r2>d2 which we do not know and hence E.
Charged up again to beat the beast 
