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

1)490 m

2)220 m

3)160 m

4)can't be determined

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    160 m

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