BTGmoderatorLU wrote:The distance between West-Town to East-Town is 15 kilometers. Two birds start flying simultaneously towards one another, the first leaving from West-Town at a speed of 4 kilometers per minute and the second bird, leaving from East-Town, at a speed of 1 kilometers per minute. What will be the distance, in kilometers, between the meeting point and West-Town?
A. 3
B. 7
C. 10
D. 12
E. 15
Since the two birds travel toward each other, they WORK TOGETHER to cover the 15 kilometers between them.
When elements work together, ADD THEIR RATES.
The combined rate for the two birds = 4+1 = 5 kpm.
Of every 5 kilometers traveled by the two birds working together, 4 kilometers are traveled by the bird leaving from West-Town.
Implication:
The bird leaving from West-Town will travel 4/5 of the 15-kilometer distance:
(4/5)(15) = 12 kilometers.
The correct answer is
D.
Private tutor exclusively for the GMAT and GRE, with over 20 years of experience.
Followed here and elsewhere by over 1900 test-takers.
I have worked with students based in the US, Australia, Taiwan, China, Tajikistan, Kuwait, Saudi Arabia -- a long list of countries.
My students have been admitted to HBS, CBS, Tuck, Yale, Stern, Fuqua -- a long list of top programs.
As a tutor, I don't simply teach you how I would approach problems.
I unlock the best way for YOU to solve problems.
For more information, please email me (Mitch Hunt) at
[email protected].
Student Review #1
Student Review #2
Student Review #3