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by magical cook » Tue Oct 23, 2007 5:00 pm
Hi Can anyone help with this? thanks
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by sanju09 » Fri Mar 23, 2012 2:16 am
magical cook wrote:Hi Can anyone help with this? thanks
It is a good question from remote to answer. Seems something wrong somewhere, I don't know...

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 = Â¾ hour.

Average speed in the first 45 minutes = 12/ (Â¾) 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/ (Â¼) 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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by Whitney Garner » Fri Mar 23, 2012 7:35 am
magical cook wrote:Hi Can anyone help with this? thanks
Received a PM to join the conversation but I must simply say:

**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
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Math is a lot like love - a simple idea that can easily get complicated

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