PS question
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It is a good question from remote to answer. Seems something wrong somewhere, I don't know...magical cook wrote:Hi Can anyone help with this? thanks
Average speed in the first 45 minutes = distance traveled in the first 45 minutes/45 minutes
From the graph
Distance traveled in the first 45 minutes = 24 - 12 = 12 kilometer. Time taken = 45 minutes = ¾ hour.
Average speed in the first 45 minutes = 12/ (¾) kilometer per hour = 16 kilometer per hour.
He completes the remaining 12 kilometer in the last 15 minutes, hence the average speed in the last 15 minutes = 12/ (¼) kilometer per hour = 48 kilometer per hour, which is 48 - 16 = [spoiler]32[/spoiler] kilometer per hour more than his average speed in the first 45 minutes.
Hence the answer must be [spoiler]32[/spoiler], none of the choices.
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Sanjeev K Saxena
Quantitative Instructor
The Princeton Review - Manya Abroad
Lucknow-226001
www.manyagroup.com
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Received a PM to join the conversation but I must simply say:magical cook wrote:Hi Can anyone help with this? thanks
**BEWARE studying from this question. First, the spelling/grammar/capitalization of the original problem is VERY bad, and second the image is distorted (labels are in the wrong places and the lines don't connect properly).
Without further information on the Source to verify that this is a reputable problem, I would avoid completely!
Remember, always beware of unknown source material - it is far WORSE to get bad advice than it is to get NO advice at all!!
Whit
Whitney Garner
GMAT Instructor & Instructor Developer
Manhattan Prep
Contributor to Beat The GMAT!
Math is a lot like love - a simple idea that can easily get complicated
GMAT Instructor & Instructor Developer
Manhattan Prep
Contributor to Beat The GMAT!
Math is a lot like love - a simple idea that can easily get complicated