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ICSE Class 10 Physics 2015 Solved Paper

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A person standing between two vertical cliffs and 480m from the nearest cliff shouts. He hears the first echo after 3s and the second echo 2 s later.
Calculate :
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Question : 49
Total: 74
The distance of the other cliff from the person.
Solution:  
Time taken to reach second echo
‌=3+2=5 sec.
‌ Now ‌‌=‌
2d
t
⇒d‌=‌
vt
2
Distance of other cliff from the person
=‌
320×5
2
=800m
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