Distance

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beater: Master | Next Rank: 500 Posts; Posts: 301; Joined: Tue Apr 22, 2008 6:07 am; Thanked: 2 times

by beater » Thu Oct 02, 2008 2:59 pm

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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Source: Beat The GMAT — Data Sufficiency | Thu Oct 02, 2008 2:59 pm

Morgoth: Master | Next Rank: 500 Posts; Posts: 316; Joined: Mon Sep 22, 2008 12:04 amFollowed by: 1 member; Thanked: 36 times

by Morgoth » Thu Oct 02, 2008 4:45 pm

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?

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beater: Master | Next Rank: 500 Posts; Posts: 301; Joined: Tue Apr 22, 2008 6:07 am; Thanked: 2 times

by beater » Fri Oct 03, 2008 11:26 am

Anyone with a different approach?

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dally_gmat: Senior | Next Rank: 100 Posts; Posts: 31; Joined: Mon Sep 15, 2008 6:16 pm; Thanked: 3 times

Re: Distance

by dally_gmat » Fri Oct 03, 2008 12:01 pm

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?

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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beater: Master | Next Rank: 500 Posts; Posts: 301; Joined: Tue Apr 22, 2008 6:07 am; Thanked: 2 times

by beater » Sun Oct 05, 2008 2:19 pm

OA - E. Thanks

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maihuna: Legendary Member; Posts: 1578; Joined: Sun Dec 28, 2008 1:49 amFollowed by: 9 members; Thanked: 82 times; GMAT Score:720

Re: Distance

by maihuna » Thu Oct 22, 2009 10:51 am

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.

I solved it this way:

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

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