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The maximum speed of some of the animals are given below:
 
the Elephant \(= 20 \ km./hr\); the Lion \(= 80 \ km./hr\); the Cheetah \(= 100 \ km./hr\).
 
Find the following ratios of their speeds in simplified form and find which ratio is the least?
 
(i) the Elephant and the Lion \(=\) i:i
 
(ii) the Lion and the Cheetah \(=\) i:i
 
(iii) the Elephant and the Cheetah \(=\) i:i