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ICSE Class 10 Physics 2018 Paper

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A person is standing at the sea shore. An observer on the ship which is anchored in between a vertical cliff and the person on the shore fires a gun. The person on the shore hears two sounds, 2 seconds and 3 seconds after seeing the smoke of the fired gun. If the speed of sound in the air is 320 ms−1320\,\text{ms}^{-1} then calculate :
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Question : 55 of 78
Marks: +1, -0
the distance between the observer on the ship and the person on the shore.
Solution:  
The time taken by sound to travel from observer on the ship to the person on the shore =2=2 seconds.
Speed of sound in air =320m/s=320 \text{m} / \text{s}
∵    \because \;\; Distance == Speed ×\times time
∵\because Distance between the observer on the ship and the person on the shore
  =320×2\;=320 \times 2
  =640m\;=640 \text{m}
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