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ATQ,
Time taken by 'K' to finish = t seconds
Then, 'M' covers = 250 - 50 = 200 metres
So, ratio of speeds of 'K' and 'M' = 250 : 200 = 5 : 4
Now, 'M' beats 'L' by 20 metres:
Speed ratio of 'M' and 'L' = 250 : (250 - 20) = 250 : 230 = 25 : 23
Combining:
K : M : L = 5×25 : 4×25 : 4×23 = 125 : 100 : 92
When 'K' runs 250 metres, 'L' covers = 250 × (92/125) = 184 metres
So, 'K' beats 'L' by 250 - 184 = 66 metres
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