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 :
A. 17 sec
B.
50029sec50029sec
C.
120029sec120029sec
D.
70029sec70029sec
Answer: Option B
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