A goods train starts running from a plac...

A goods train starts running from a place at 1 : 00 P.M. at the speed of 18 km/hr. Another goods train starts from the same place at 3 : 00 P.M. in the same direction and overtakes the first train at 9 : 00 P.M. The speed of the second train in km/hr is :

A)24

B)30

C)15

D)18

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