Events & Promotions
|
|
GMAT Club Daily Prep
Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.
Customized
for You
Track
Your Progress
Practice
Pays
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
Apr 2610:00 AM EDT
-11:00 AM EDT
The Target Test Prep course represents a quantum leap forward in GMAT preparation, a radical reinterpretation of the way that students should study. Try before you buy with a 5-day, full-access trial of the course for FREE!
Apr 2711:00 AM EDT
-12:00 PM EDT
Prefer video-based learning? The Target Test Prep OnDemand course is a one-of-a-kind video masterclass featuring 400 hours of lecture-style teaching by Scott Woodbury-Stewart, founder of Target Test Prep and one of the most accomplished GMAT instructors
Apr 2808:00 AM PDT
-11:00 AM PDT
Whether you are just beginning your MBA journey or fine-tuning your path to a 700+ score, GMAT Day is designed to give you a competitive edge.
07 Feb 2023, 19:19
Kudos
Bookmarks
Kimberly77
Given: A certain car increased its average speed by 5 miles per hour in each successive 5-minute interval after the first interval. If in the first 5-minute interval its average speed was 20 miles per hour, how many miles did the car travel in the third 5-minute interval?
In the first interval, the car travels 20 mph for 5 minutes.
In the second interval, the car travels 25 mph for 5 minutes.
In the third interval, the car travels 30 mph for 5 minutes.
Speed during the SECOND 5-minute interval = 25 mph
Speed during the THIRD 5-minute interval = 30 mph
08 Feb 2023, 04:55
Kudos
Bookmarks
Noted thanks BrentGMATPrepNow.
in each successive 5-minute interval > time is fixed and no increment here.
in each successive 5-minute interval > time is fixed and no increment here.
10 Feb 2023, 04:44
Kudos
Bookmarks
Kimberly77
Hi Kimberly77
Thanks for your query.
You are getting confused between the total time of 3 successive intervals and the time of THE 3rd interval. Let me clarify this to you by Translating that specific portion of the given question again.
TRANSLATION:
A certain car increased its average speed by 5 miles per hour in each successive 5-minute interval after the first interval. If in the first 5-minute interval its average speed was 20 miles per hour, how many miles did the car travel in the third 5-minute interval?
Observe only the underlined part of the above question. Let’s translate this phrase carefully.
- - In the last sentence, the question asks us to calculate the number of miles that the car travelled in THIS THIRD 5-minute interval, and NOT TILL this third 5-minute interval.
- Observe, the time would have been 15 minutes if the question asked for the distance covered TILL the 3rd interval.
There is another big mistake that you were making even if your interpretation were correct - taking speed as 30 mph and time as 15 min. Observe:
- You considered time = 15 mins, that is total time till 3rd interval, and speed = 30 mph for this whole 15 mins time span. This is WRONG!
- Why? Because the speed is different for every 5-minutes interval. It is 20, 25 and 30 respectively for the three consecutive intervals.
- - Total distance = [(20 × 5) + (25 × 5) + (30 × 5)] and NOT 30 × 15.
And that’s it! Just a minor misunderstanding of words and it will lead you to the wrong answer.
TAKEAWAYS:
TRANSLATE every question from English to Math with utmost care. This is the very first step and very crucial too. You do the correct translation, and you reach halfway to the correct answer.
Hope this helps!
Best,
Aditi Gupta
Quant expert, e-GMAT
