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how to solve questions of shch type quikly?

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by nicktimoshenko » Sun Aug 08, 2010 3:00 am
questions of sach type very easy for me if i have a calculator and enough time. but how to solve them quikly?

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first attempt 540 (Q48 V17)
second attempt 610 (q47 v27)
my blog:
https://waytotopbs.blocked
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Source: — Data Sufficiency |
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by kvcpk » Sun Aug 08, 2010 3:15 am
This problem doesnt require much calculation.

30 mins to cycle from house to library. IS distance > 6 miles?
1 mile = 5280 feet
So 6 miles = 6*5280
For travelling this distance in 30 mins, speed required is:
6*5280/60*30 = 528/30 = 176/10 = 17.6 feet/sec

avg speed> 16 ft/sec
Doesnt tell if its greater than 17.6
INSUFF

avg speed less than 18feet/sec
Doesnt tell if its greater than 17.6
INSUFF

Combining:
16<Speed<18
Still we do not know if the speed is greater than 17.6

Hence INSUFF

pick E
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by HPengineer » Sun Aug 08, 2010 8:24 pm
damn i didnt take into account the decimal values... when they said less then 18 i only tested 17ft per second.. so i picked B was suff to say he did not travel the distance..
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