Answers

2015-04-27T20:47:24+05:30
Let the bridge be of length x m.
45 km/h=45*5/18 m/s=12.5 m/s.
Total Distance =(130+x) m.
Time =30 secs
Since S=D/T,
12.5=(130+x)/30
or,12.5*30=130+x
or,375=130+x
or,x=375-130
or,x=245
Therefore , length of bridge is 245 m.
Ans:(c)245 m
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2015-04-27T21:01:45+05:30
Lets x be length of bridge
hence x+130 is total distance
x+130/30=45*5/18 ( we know that distance/time=velocity)
after solving this equation
you get x=245m
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