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	Choose the correct choice from the following answers:
A) 1 : 2	B) 3 : 1	C) 2 : 1	D) 1 : 3	E) 2 : 3
Given that train K crosses a pole in 30 seconds and train L crosses the same pole in one minute and 15 seconds.   Let the length of train K be Lk and that of train L be Ll   given that Lk = 3/4 Ll   As the train K and L crosses the pole in 30 seconds and 80 seconds respectively,   =&gt; Speed of train K = sk = Lk/30   Speed of train L = sl = Ll/80   Lk = 3/4 Ll   =&gt; sk = 3/4 Ll/(30) = Ll/40   Ratio of their speeds = sk : sl   = Ll/40 : Ll/80   =&gt; 1/40 : 1/80 = 2 : 1   Answer : 2 : 1
<result>C</result>
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