A sonar signal takes 6 seconds to travel down to an underwater reef and reflect back to the vessel. If the speed of sound in water is 1500 m/s, find the depth of the reef in kilometers. MCQ with Answer and Explanation
Question
Report Error
Discuss this Question (0)
Practice More Time Speed and Distance Questions
Question #1
Report Error
A train traveling at 60 km/h overtakes a motor cyclist riding at 12 km/h in the same direction in 12 seconds. Find the length of the train.
Correct Answer: Option A
Explanation:
Relative speed = 60 - 12 = 48 km/h = 48 * (5/18) = 40/3 m/s. Length of train = Relative speed * Time = (40/3) * 12 = 160 meters.
Relative speed = 60 - 12 = 48 km/h = 48 * (5/18) = 40/3 m/s. Length of train = Relative speed * Time = (40/3) * 12 = 160 meters.
This question belongs to:
Maths
Time Speed and Distance
Question #2
Report Error
A sound wave maps a distance of 4080 meters between two hills in 12 seconds. Find the speed of sound.
Correct Answer: Option A
Explanation:
Speed of sound = Distance / Time = 4080 / 12 = 340 m/s.
Speed of sound = Distance / Time = 4080 / 12 = 340 m/s.
This question belongs to:
Maths
Time Speed and Distance
Question #3
Report Error
A driver accounts 1/4 of his total delivery distance at 25 km/h and the remaining 3/4 at 75 km/h. Find his average speed for the full delivery route.
Correct Answer: Option B
Explanation:
Let total distance be 100 km. First part = 25 km; Time = 24 / 25 = 1 hour. Remaining part = 75 km; Time = 75 / 75 = 1 hour. Total distance = 100 km, Total time = 2 hours. Average speed = 100 / 2 = 50 km/h.
Let total distance be 100 km. First part = 25 km; Time = 24 / 25 = 1 hour. Remaining part = 75 km; Time = 75 / 75 = 1 hour. Total distance = 100 km, Total time = 2 hours. Average speed = 100 / 2 = 50 km/h.
This question belongs to:
Maths
Time Speed and Distance
No comments yet. Be the first to start the discussion!