1.

A security guard is on duty at a post, 7 kmsaway from the fort. On hearing the sound of thesiren of the fort, he adjusts his watch. If thespeed of sound in air is 350 metres/sec, his watch(a) show correct time(b) be fast by 20 seconds(c) be slow by 20 sec.(d) be slow by 10 seconds

Answer»

Given Distance from Fort D = 7km = 7000 mSpeed of sound S = 350 m/sec

So time taken to reach the siren sound to security guardT = D / S = 7000/350 = 20T = 20 sec

Therefore, guard watch be slow by 20 sec

(c) is correct option



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