Mary passed a certain gas station on a highway while traveling west at a constant speed of 50 miles per hour. Then, 15 minutes later, Paul passed the same gas station while traveling west at a constant speed of 60 miles per hour. If both drivers maintained their speeds and both remained on the highway […]
How long after he passed the gas station did Paul catch up with Mary? Read the Full Article »
The value of (10^8-10^2)/(10^7-10^3) is closest to which of the following? A. 1 B. 10 C. 10^2 D. 10^3 E. 10^4 Correct Answer: B Full explanation coming soon. Send us a note if you’d like this added to the express queue! You’ll find tons of practice questions, explanations for GMAT Official Guide questions, and strategies
The value of (10^8-10^2)/(10^7-10^3) is closest to which of the following? Read the Full Article »
For every positive even integer n, the function h(n) is defined to be the product of all the even integers from 2 to n, inclusive. If p is the smallest prime factor of h(100) +1, then p is? A. Between 2 and 20 B. Between 10 and 20 C. Between 20 and 30 D. Between
If n and y are positive integers and 450y=n^3, which of the following must be an integer? I. y/3∗2^2∗5 II. y/3^2∗2∗5 III. y/3∗2∗5^2 A. None. B. I only. C. II only. D. III only. E. I, II, and III Correct Answer: B Full explanation coming soon. Send us a note if you’d like this added
Pumps A, B, and C operate at their respective constant rates. Pumps A and B, operating simultaneously, can fill a certain tank in 6/5 hours; pumps A and C, operating simultaneously, can fill the tank in 3/2 hours; and pumps B and C, operating simultaneously, can fill the tank in 2 hours. How many hours
