Street Bicycles

really need help pls?

A very tough question regarding...?
In a chain drive mechanisms,which can be found in bicycles with the pedal attached to the driven sprokect,the driver sprocket rotates through 360 degree.If the transmission ration of this chain drive mechanism is 0.65,at what angle will the driven sprocket rotates.

Next,A girl weighing 50kg sits at one end of a plank.When a load is placed on the other end,avertical distance of 60cm is detected while the girl is raised by 30c.Calculate the transmission ratio of the plank

Pls help and explain

for first the answer is 360*.65=234
next the position of the problem is not clear

Extra Hand Powered Bicycle part 2

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