1.

A passenger sitting in a train of length 100 m, which is running with speed of 60km/h passing through two bridges, notices that the crosses the first bridge and the second bridge in time intervals which are in the raito of 7 : 4 respectively. If the length of first bridge be 280 m, then the length of second bridge is.

Answer»

490 m
220m
160m
can't be determined

Answer :C


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