Lets rephrase the question in terms of Rate (R) , Time (T) and Distance (D).cmal_s wrote:q) Carlos took 0.5 hours from home to the library was the distance he travelled greater than 6 miles ( 1miles = 5280 feet)
1) His average speed in the trip was greater than 16 feet per second
2) His average speed was less than 18 feet per second
answer is E
dont get it
R x T = D
x 30x60 sec = D
So the question asks IS x(1800) > 6 miles (31680 feet )
In directly we need to find x ? or Rate (R)
statement (1) : x > 16
So lets take x = 17
R x T = 17 x 1800 = 30600 < 31680 .
But if we take x = 18 then
R x T = 32400 > 31680
So not sufficient .
statement (2) :
x < 18
So x could be x = 17
And we already know that when x = 17 distance covered is less than 6 miles .
But dont assume rate to be an integer until and unless clearly stated .
Here the rate could be 17.6 also which is less than 18 .
And that is exactly equal to 31680 .
So clearly not sufficient .
Combine (1) and (2)
so 16 < x < 18
again not sufficient hence E.
