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In a submarine fitted with SONAR, the time interval between the generation of an ultrasonic wave and the receipt of its echo is 200s. What is the distance of the enemy submarine? The speed of the sound in water is 1.450km/s.

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In a submarine fitted with SONAR, the time interval between the generation of an ultrasonic wave and the receipt of its echo is 200s. What is the distance of the enemy submarine? The speed of the sound in water is 1.450km/s.

(a) 2.811 km

(b) 112.5 km

(c) 145 km

(d) 100 km

I got this question in an interview.

This question is from Units and Measurements in chapter Advanced Engineering Materials of Engineering Physics II

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Right choice is (c) 145 km

For explanation I would say: The distance of the enemy submarine = (speed × time)/2 = 145 km.

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