In a race of one kilometre. A gives B a start of 100 metres and still wins by 20 seconds. But if A gives B a start of 25 seconds, B wins by 50 metres. The time taken by A to run kilometre is :
17 sec
\(\frac{{500}}{{29}}{ \text{sec}}\)
\(\frac{{1200}}{{29}}{ \text{sec}}\)
\(\frac{{700}}{{29}}{ \text{sec}}\)
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