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01 Jan 2022, 23:55
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Question: In the following question, why can't we find weighted average speed using distance as the weight?
On a 600-kilometer trip, a car traveled half the distance at an average speed of 60 kilometers per hour (kph) and the other half at an average speed of 100 kph. The car did not stop between the two halves of the trip. What was the car’s average speed during the trip as a whole?
This problem is given as an example in the OG, so it does not contain options. The correct answer if 75 kph.
On a 600-kilometer trip, a car traveled half the distance at an average speed of 60 kilometers per hour (kph) and the other half at an average speed of 100 kph. The car did not stop between the two halves of the trip. What was the car’s average speed during the trip as a whole?
This problem is given as an example in the OG, so it does not contain options. The correct answer if 75 kph.
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Archit3110
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02 Jan 2022, 01:50
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Diligence1342
total time; 300/60 + 300/100 ; 5+3 ; 8 hrs
avg speed = 600/8 ; 75 kmph
02 Jan 2022, 12:57
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Hello, Diligence1342. You will often find that Quant questions can be approached in more than one way. Even something as simple as 8.8 * 2 might be solved in a few ways—e.g., (8 * 2) + (0.8 * 2), or (9 * 2) - (0.2 * 2). As long as your method allows you to arrive at the correct answer within a reasonable amount of time, that method is just as effective as another. It is only when you miss questions or solve them inefficiently—say, in three minutes or more—that you need to take note and then look up ways to solve such problems more effectively. I would recommend you check out some of the bookmarked posts by Quant Expert Bunuel to gain a solid grounding in theory if you find certain areas lacking. Also, to get the most use out of your official guide, look up questions you struggle with in the forum. The responses by Quant Experts are astounding, and there is something for everyone to appreciate.
Best of luck with your studies.
- Andrew
Best of luck with your studies.
- Andrew
