tag:blogger.com,1999:blog-15628310.post114104478155705763..comments2020-05-15T09:19:15.838-04:00Comments on Question of the day: An oldie but a goodieAnonymoushttp://www.blogger.com/profile/18153935609499338685noreply@blogger.comBlogger2125tag:blogger.com,1999:blog-15628310.post-1141131405533333552006-02-28T07:56:00.000-05:002006-02-28T07:56:00.000-05:00The correct answer is 30mph. Most people's instinc...The correct answer is 30mph. Most people's instinct is to add the 20mph and the 60mph and divide by two (20 + 60 = 80. 80 รท 2 = 40), which is the way most averages are calculated. But this is not the way to calculate the average of two speeds over a given distance. As Karnov said, the correct answer can only be found by adding the distances, then adding the times, and then calculating a new average: ie., 25 miles + 25 miles = total distance of 50 miles. 75 minutes and 25 minutes = total time of 100 minutes. 100 minutes = 1.6666 (recurring) hrs. 50 miles divided by 1.6666 hrs = 30 mph.Anonymoushttps://www.blogger.com/profile/18153935609499338685noreply@blogger.comtag:blogger.com,1999:blog-15628310.post-1141052803030582162006-02-27T10:06:00.000-05:002006-02-27T10:06:00.000-05:00It took him 100 total minutes to go 50 miles so I ...It took him 100 total minutes to go 50 miles so I will say. 30MPHDarvhttps://www.blogger.com/profile/09533799179860083881noreply@blogger.com