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GMAT Inequalities is a high-frequency topic in GMAT Quant, but many students struggle because the concepts behave differently from standard algebra. Understanding the right rules, patterns, and edge cases can significantly improve both speed and accuracy.- May 06
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01 Dec 2015, 08:48
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So I was going through a couple of varied DRT problems, and this one took longer than it should. My question is, how can I approach it differently? Or more efficiently?
Train P and Q travel from A to B at 100 mph, and 120 mph respectively. Train Q stops for 10 minutes at station C, but reaches Station B, 5 Minutes before Train P.
So, what I initially tried do was the following
-------|--D----|---R---|---T------|
P--------x-------100---- t-5----
-------|--------|--------|---------|
P--------x-------120---- t+10----
-------|--------|--------|---------|
100t-500 = 120t + 1200
Which is obviously wrong. Then I thought about what I'm actually doing
P's time is five minutes behind T's time after T stop for 10 minutes
P's Time - 5 = Q's Time + 10
P's Time = \(\frac{x}{100}\) and Q's Time = \(\frac{x}{120}\)
So we have:
\(\frac{x}{100}\) = \(\frac{x}{120}\) + \(\frac{15}{60}\)
x=150
So, I suppose I was wondering if anyone has any suggestions on tackling these kind of problems? Or maybe a different approach.
-Thanks
Train P and Q travel from A to B at 100 mph, and 120 mph respectively. Train Q stops for 10 minutes at station C, but reaches Station B, 5 Minutes before Train P.
So, what I initially tried do was the following
-------|--D----|---R---|---T------|
P--------x-------100---- t-5----
-------|--------|--------|---------|
P--------x-------120---- t+10----
-------|--------|--------|---------|
100t-500 = 120t + 1200
Which is obviously wrong. Then I thought about what I'm actually doing
P's time is five minutes behind T's time after T stop for 10 minutes
P's Time - 5 = Q's Time + 10
P's Time = \(\frac{x}{100}\) and Q's Time = \(\frac{x}{120}\)
So we have:
\(\frac{x}{100}\) = \(\frac{x}{120}\) + \(\frac{15}{60}\)
x=150
So, I suppose I was wondering if anyone has any suggestions on tackling these kind of problems? Or maybe a different approach.
-Thanks
01 Dec 2015, 10:31
Kudos
Bookmarks
Hi malkadhi,
You'll likely get more of a response if you post this question in the proper Quant Forum here (and if this is a PS question, then you should include the 5 answer choices):
gmat-quantitative-section-7/
GMAT assassins aren't born, they're made,
Rich
You'll likely get more of a response if you post this question in the proper Quant Forum here (and if this is a PS question, then you should include the 5 answer choices):
gmat-quantitative-section-7/
GMAT assassins aren't born, they're made,
Rich
