Half a croissant, on a plate, with a sign in front of it saying '50c'
h a l f b a k e r y
The word "How?" springs to mind at this point.

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BikePowerShare

Share your biking power!
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A vertical rotating shaft is driven by the rear wheel of your bicycle. At the top, about 6 feet above the road, is another gearbox with a number of exposed sockets.

You can attach a flexible drive shaft to the socket, The other end of the flexible drive is attached to the similar socket on your friend's bike.

A big visible lever on the vertical shaft engages a ratchet clutch in one direction, the lever marked on each side "MASTER" or "SLAVE".

This equippage allows you to assist your penguin friend. Or vice-versa.

Just keep close together!

pocmloc, Oct 07 2012

Bicycle tow rope http://www.bicyclebungee.com/
A commercial purpose-made version of the common retractable dog-leash tow rope [CraigD, Oct 12 2012]

[link]






       Tow ropes are an old, simpler, and I'm fairly certain more mechanically efficient way for a stronger or fresher rider to assist another.   

       I've done this with about 5 m of simple braided climbing rope tied to my seat post and looped over a following bike's handlebar water bottle rack, and fond it to work well.
CraigD, Oct 12 2012
  
      
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