Question

please solve these questions

Answer 1

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.

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