SOLUTION: A man walks six miles at four miles per hour. At what speed would he need to travel during the next two and a half hours to have an average speed of six miles an hour during the e
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Question 512601: A man walks six miles at four miles per hour. At what speed would he need to travel during the next two and a half hours to have an average speed of six miles an hour during the entire trip?
Found 2 solutions by solver91311, josmiceli:
Answer by solver91311(24713) (Show Source): You can put this solution on YOUR website!
Since he has already been walking for 1 and 1/2 hours (distance divided by rate equals time, so 6 divided by 4 = 1.5), the entire trip for which he wants to average 6 miles per hour is 4 hours long (2.5 plus 1.5). 6 miles per hour times 4 hours is 24 miles. He has already travelled 6 miles, so he needs to travel 18 more miles (24 minus 6) in 2.5 hours. 18 divided by 2.5.
He better find a bicycle.
John
My calculator said it, I believe it, that settles it
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Average speed is ( total distance ) / ( total time )
For the 1st 6 miles
hrs
Let = speed for last hrs
--------------
Average speed = mi/hr
Total distance =
He would have to travel at 7.2 mi/hr
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