Train K crosses a pole in 30 seconds and train L crosses the same pole in one minute and 20 seconds. The length of train K is three-fourths the length of train L. What is the ratio of the speed of train K to that of train L ?
A) 1 : 3
B) 2 : 1
C) 3 : 1
D) 1 : 2
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the answer is option A
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