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? MCQ with Answer and Explanation
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Question #1
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A person travels a distance of 24 km at a speed of 6 km/h, another 24 km at 8 km/h and a third 24 km at 12 km/h. Find his average speed for the whole journey.
Correct Answer: Option B
Explanation:
Total distance = 24 + 24 + 24 = 72 km. Total time = 24/6 + 24/8 + 24/12 = 4 + 3 + 2 = 9 hours. Average speed = 72 / 9 = 8 km/h.
Total distance = 24 + 24 + 24 = 72 km. Total time = 24/6 + 24/8 + 24/12 = 4 + 3 + 2 = 9 hours. Average speed = 72 / 9 = 8 km/h.
This question belongs to:
Maths
Time Speed and Distance
Question #2
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Walking at 4/5 of his normal pace, an official is 12 minutes late to his assignment station. Find his usual baseline time.
Correct Answer: Option B
Explanation:
New speed = 4/5 of usual speed => New time = 5/4 of usual time. Difference = 1/4 of usual time = 12 minutes. Usual time = 12 * 4 = 48 minutes.
New speed = 4/5 of usual speed => New time = 5/4 of usual time. Difference = 1/4 of usual time = 12 minutes. Usual time = 12 * 4 = 48 minutes.
This question belongs to:
Maths
Time Speed and Distance
Question #3
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A sound wave travels at a speed of 330 m/s. How much time will it take to travel a distance of 9.9 km?
Correct Answer: Option C
Explanation:
Distance = 9.9 km = 9900 meters. Time = Distance / Speed = 9900 / 330 = 30 seconds.
Distance = 9.9 km = 9900 meters. Time = Distance / Speed = 9900 / 330 = 30 seconds.
This question belongs to:
Maths
Time Speed and Distance
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