A sound wave maps along a valley channel at 330 m/s. How many seconds are required to span a distance length of 9.9 km? MCQ with Answer and Explanation
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Question #1
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The speeds of two cars are in the ratio 5 : 3. If they cover the same total distance, and the slower car takes 2.5 hours, how much time does the faster car take?
Correct Answer: Option A
Explanation:
Ratio of speeds = 5:3, so ratio of times taken = 3:5. The slower car corresponds to 5 parts = 2.5 hours => 1 part = 0.5 hours. Time for the faster car = 3 parts = 3 * 0.5 = 1.5 hours.
Ratio of speeds = 5:3, so ratio of times taken = 3:5. The slower car corresponds to 5 parts = 2.5 hours => 1 part = 0.5 hours. Time for the faster car = 3 parts = 3 * 0.5 = 1.5 hours.
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Maths
Time Speed and Distance
Question #2
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A person covers 1/3 of a distance at 15 km/h, 1/3 at 30 km/h and the last 1/3 at 60 km/h. Find the average speed.
Correct Answer: Option C
Explanation:
Let each third of the distance be 60 km. Total distance = 180 km. Total time taken = 60/15 + 60/30 + 60/60 = 4 + 2 + 1 = 7 hours. Average speed = 180 / 7 = 25.71 km/h.
Let each third of the distance be 60 km. Total distance = 180 km. Total time taken = 60/15 + 60/30 + 60/60 = 4 + 2 + 1 = 7 hours. Average speed = 180 / 7 = 25.71 km/h.
This question belongs to:
Maths
Time Speed and Distance
Question #3
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Walking at 5/6 of his normal pace, a man is 10 minutes late to his workplace. What is his normal time?
Correct Answer: Option A
Explanation:
New speed = 5/6 of normal pace => New time = 6/5 of normal time. Difference = 1/5 of normal time = 10 minutes. Normal time = 10 * 5 = 50 minutes.
New speed = 5/6 of normal pace => New time = 6/5 of normal time. Difference = 1/5 of normal time = 10 minutes. Normal time = 10 * 5 = 50 minutes.
This question belongs to:
Maths
Time Speed and Distance
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