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Brainteaser - How fast?
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mzplcg
 


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Brainteaser - How fast?

A man has a 2 mile journey to undertake. For the first mile he averages 30 mph. So, how fast does he have to go in the second mile to average 60mph for the whole journey?  
Post #62145315th Mar 2010 8:40 pm
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DSL
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90   
Post #62146015th Mar 2010 8:43 pm
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Bodsy
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90? or is there a trick with the time it takes given that he's already completed 1 mile..... Bodsys Brake Bible

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Post #62146115th Mar 2010 8:44 pm
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mzplcg
 


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Nice try but no banana Thumbs Up  
Post #62146315th Mar 2010 8:44 pm
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mzplcg
 


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Bodsy wrote:
90? or is there a trick with the time it takes given that he's already completed 1 mile.....


Along the right lines Sir Thumbs Up  
Post #62146515th Mar 2010 8:45 pm
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DSL
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I await to hear what the trick part is! Shocked   
Post #62146615th Mar 2010 8:46 pm
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Bodsy
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Can he ever do that? Given that he's already gone 2 minutes for 1 mile, he'll never reach 2 miles in 2 minutes..... (60MPH) Bodsys Brake Bible

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Post #62146715th Mar 2010 8:47 pm
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NJF
 


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Required speed for the second mile = c.  
Post #62146915th Mar 2010 8:48 pm
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mzplcg
 


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Exactly !! He's need a time machine Mr. Green  
Post #62147015th Mar 2010 8:48 pm
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DSL
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OK slight mod, average of 90 over 2nd mile. Thumbs Up   
Post #62147115th Mar 2010 8:48 pm
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thriftwood
 


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Well - I think he needs to drop through a wormhole & travel the second mile in 0 seconds in order to average 60 MPH over the two miles Shocked
Richard  
Post #62147315th Mar 2010 8:49 pm
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mzplcg
 


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Answer as above. It cannot be done. Having used the 2 minutes for the 1st mile he'd have to do the second mile in zero time. Even a barried up Corsa 1.2 can't go that fast Thumbs Up 

Last edited by mzplcg on 15th Mar 2010 8:50 pm. Edited 1 time in total 
Post #62147415th Mar 2010 8:49 pm
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Bodsy
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Del, he still won't manage 60MPH average over the course of his 2 mile journey...... Bodsys Brake Bible

D4/D3 Remote FBH heat kits
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Post #62147515th Mar 2010 8:50 pm
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DSL
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NJF wrote:
Required speed for the second mile = c.


or infinity, not c! Rolling Eyes   
Post #62147615th Mar 2010 8:50 pm
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NJF
 


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DSL wrote:
To infinity, and beyond!

Time the change your avatar, Derek. Wink

  
Post #62147815th Mar 2010 8:53 pm
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