A sound pulse takes 6 seconds to reach the ocean floor and bounce back to a submarine. If the speed of sound in water is 1480 m/s, find the depth of the ocean floor. MCQ with Answer and Explanation

A sound pulse takes 6 seconds to reach the ocean floor and bounce back to a submarine. If the speed of sound in water is 1480 m/s, find the depth of the ocean floor.
A. 8880 meters
B. 6660 meters
C. 2220 meters
D. 4440 meters
Answer: Option D
Solution (By JKSSB Mock Tests)
Total distance traveled = Speed * Total Time = 1480 * 6 = 8880 meters. Depth is half of total distance = 8880 / 2 = 4440 meters.

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Practice More Time Speed and Distance Questions

Question #1
A boat covers 20 km downstream in 2 hours and the same distance upstream in 5 hours. Find the speed of the stream.
A. 3.5 km/h
B. 2.5 km/h
C. 3.0 km/h
D. 4.0 km/h

Correct Answer: Option C


Explanation:
Downstream speed = 20 / 2 = 10 km/h. Upstream speed = 20 / 5 = 4 km/h. Speed of stream = (10 - 4) / 2 = 6 / 2 = 3 km/h.

This question belongs to: Maths Time Speed and Distance
Question #2
A worker reaches his factory 15 minutes late if he walks at 4 km/h, and 10 minutes early if he walks at 6 km/h. Find the distance to his factory.
A. 8 km
B. 4 km
C. 6 km
D. 5 km

Correct Answer: Option D


Explanation:
Time difference = 15 - (-10) = 25 minutes = 25/60 = 5/12 hour. Let distance be d. d/4 - d/6 = 5/12 => d/12 = 5/12 => d = 5 km.

This question belongs to: Maths Time Speed and Distance
Question #3
A person covers a distance of 60 km at 15 km/h and another 40 km at 20 km/h. Find his average speed for the full journey.
A. 16.66 km/h
B. 16.0 km/h
C. 18.0 km/h
D. 17.5 km/h

Correct Answer: Option A


Explanation:
Total distance = 60 + 40 = 100 km. Time 1 = 60 / 15 = 4 hours. Time 2 = 40 / 20 = 2 hours. Total time = 6 hours. Average speed = 100 / 6 = 16.66 km/h.

This question belongs to: Maths Time Speed and Distance