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rate and time

by Jinglander » Wed Aug 11, 2010 7:59 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 feel at r2 feet per second.

1 d1 is 30 greater than d2
2 r1 is 30 greater than r2


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Source: — Data Sufficiency |
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by selango » Wed Aug 11, 2010 8:54 pm
d1/r1>d2/r2?

stmt1,

d1=d2+30

No info about r1 and r2.

Insuff

stmt2,

r1=r2+30

No info about r1 and r2.

Insuff


combining 1 and 2,

d2+30/r2+30>d2/r2?

d2=120,r2=20

3<6

t1<t2

d2=100,t2=100

1=1

t1=t2

Insuff

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