please solve these questions
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1. Answer: Option C
Explanation:
Speed = 45 x 5/18 m/sec = 25/2 m/sec.
Time = 30 sec.
Let the length of bridge be x metres.
Then, 130 + x/30 = 25/2
2(130 + x) = 750
x = 245 m.
2.Answer: Option C
Explanation:
Speed = ( 78 x 5/18 m/sec) = ( 65/3 m/sec.)
Time = 1 minute = 60 seconds.
Let the length of the tunnel be x metres.
Then, ( 800+ x/60) = 65/3
=> 3(800 + x) = 3900
=> x = 500.
Hope it helps.
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