A sound wave travels at 340 m/s. How much distance in kilometers does it cover in exactly 15 seconds? MCQ with Answer and Explanation
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Question #1
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A vehicle covers a clear run path at an average speed of 50 km/h in 7 hours. At what speed must it travel to wrap up the same path in 5 hours?
Correct Answer: Option B
Explanation:
Distance = 50 * 7 = 350 km. New required speed = 350 / 5 = 70 km/h.
Distance = 50 * 7 = 350 km. New required speed = 350 / 5 = 70 km/h.
This question belongs to:
Maths
Time Speed and Distance
Question #2
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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 A
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
Question #3
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A motorboat rows 16 km/h in still water and the speed of the river current is 4 km/h. Find the time taken to row 80 km downstream.
Correct Answer: Option A
Explanation:
Downstream speed = 16 + 4 = 20 km/h. Time taken = 80 / 20 = 4 hours.
Downstream speed = 16 + 4 = 20 km/h. Time taken = 80 / 20 = 4 hours.
This question belongs to:
Maths
Time Speed and Distance
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