Question

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)

• A. 3 seconds fast
• B. 3 seconds slow
• C. 6 seconds fast
• D. 6 seconds slow

Answer 1

Answer: (D)

6 seconds slow

Answer 2

Time lost in covering the distance of 2 $km$ by the sound waves $t = \frac{d}{v} = \frac{2000}{330} = 6.06$sec ≈ 6 sec