GMAT Prep ?? (Carlos Average Speed)

dferm

If it took Carlos 1/2 hour to cycle from his house to the library yesterday, was the distance that he cycled greater than 6 miles? (Note: 1mile = 5,280)

(1) The average speed at which Carlos cycled from his house to the library yesterday was greater than 16 feet per second.

(2) The average speed at which Carlos cycled from his house to the library yesterday was less than 18 feet per second.

Can someone help... I answered this question correctly but can setup up equation..

Thanks..

amitansu · Posted: Fri May 09, 2008 11:10 pm Post subject:

Ans E.

From 1: x> 16ft/s (x assumed speed)
not sufficient no upper limit...

from 2: x< 18ft/s
not sufficient, no lower limit..

combining both, 16<x<18> 6*5280=31680 ft ?

if taken 16.1 then, 16.1*30*60=28980 <31680> 31680 so insufficient.