gmatophobia wrote:
PS Question 1 - Jan 17 Fanny and Alexander are 360 miles apart and are traveling in a straight line toward each other at a constant rate of 25 mph and 65 mph respectively, how far apart will they be exactly 1.5 hours before they meet? A. 135 miles B. 90 miles C. 70 miles D. 65 miles E. 25 miles Source:
GMAT Club Tests | Difficulty: Medium
total separation = 360 miles
Both are moving towards each other, relative speed = 25+65 = 90 mph
so they meet after 360/90 hr = 4 hr
but, 1.5 hr before they meet, they travelled distance = 90 * (4 - 1.5) miles = 225 miles
so, distance beteem them remains = 360-225 = 135 miles
Option A
gmatophobia wrote:
DS Question 1 - Jan 17 {a, b, c, d} What is the mode of the list above? (1) The product of no two elements of the list is positive (2) The range of the elements of the list is 0 Source:
GMAT Club Tests | Difficulty: Hard
Statement1:
{a,b,c,d} product of no two numbers is "positive"
so all number can be "0"
or 3 numbers are zero, the last number is any number
or 2 numbers are zero, rest two are opposite sign number
the mode in all case is "0" as it appears most often in any of the above combination
(1) seems Sufficient statement
Statement2:
range of set is zero
now any of these cases are possible:
{34,34,34,34}
{-6,-6,-6,-6}
{2,3,5,5} ... so on
we don’t have a fix which number will be treated as mode
so, insufficient statement
going with option A ?
PS : {2,3,5,5} is an invalid example! , ignore it