Hi. Has anyone seen this?(adsbygoogle = window.adsbygoogle || []).push({});

http://www.nytimes.com/ref/science/20070313_PROF_GRAPHIC.html

I got all the problems except the one that says

"I walk from home to school in 30 minutes and my brother takes 40 minutes. My brother left 5 minutes before I did. In how many minutes will I overtake him?"

I said we need to know how fast each brother is walking.

apparently the answer is 15 minutes??

Is it because their difference in 10 minutes + 5 minutes head start?

if so, that makes no sense to me.

why is the answer 15 minutes?

thanks

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# NYT math problem

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