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Q.

A man sets his watch by a whistle that is 2 km away. How much will his watch be in error. (speed of sound in air 330 m/sec)

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a

3 seconds fast

b

3 seconds slow

c

6 seconds fast

d

6 seconds slow

answer is D.

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Detailed Solution

Time lost in covering the distance of 2 km by the sound waves t=dv=2000330=6.06sec ≈ 6sec
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