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A bicycle climbs a certain hill at 10 miles per hour and returns at 20 miles per hour. What is its average speed for the entire trip?

civonamzuk  May 7, 2015

Best Answer 

 #1
avatar+87301 
+16

It's NOT 15 mph  {as many people would think !!!}

There's an easy "formula" for this:

[2(R1)(R2)] / [ R1 + R2 ]       where R1 and R2 are the rates   ... so we have

[2(10)(20)] / [10 + 20]  =

400 / 30  =

about 13.33  mph

 

  

CPhill  May 7, 2015
 #1
avatar+87301 
+16
Best Answer

It's NOT 15 mph  {as many people would think !!!}

There's an easy "formula" for this:

[2(R1)(R2)] / [ R1 + R2 ]       where R1 and R2 are the rates   ... so we have

[2(10)(20)] / [10 + 20]  =

400 / 30  =

about 13.33  mph

 

  

CPhill  May 7, 2015

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