A car covers a sector line of 420 km at a uniform speed. If its velocity index is raised by 10 km/h, it covers the course loop line in exactly 6 hours. Find the original speed. MCQ with Answer and Explanation
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Question #1
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A man walks a certain distance at a speed of 4 km/h and runs back at 16 km/h. Find his average speed.
Correct Answer: Option B
Explanation:
Average Speed = (2 * 4 * 16) / (4 + 16) = 128 / 20 = 6.4 km/h.
Average Speed = (2 * 4 * 16) / (4 + 16) = 128 / 20 = 6.4 km/h.
This question belongs to:
Maths
Time Speed and Distance
Question #2
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Walking at 4/5 of his normal speed, a man is 12 minutes late. What is his usual time to cover the journey?
Correct Answer: Option B
Explanation:
New Time = 5/4 of usual time. Difference = 1/4 * Usual Time = 12 minutes => Usual Time = 48 minutes.
New Time = 5/4 of usual time. Difference = 1/4 * Usual Time = 12 minutes => Usual Time = 48 minutes.
This question belongs to:
Maths
Time Speed and Distance
Question #3
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A vehicle covers a total distance of 280 km. It finishes the first 120 km at 40 km/h and the remaining 160 km at 80 km/h. Find its average speed.
Correct Answer: Option A
Explanation:
Time for first section = 120 / 40 = 3 hours. Time for second section = 160 / 80 = 2 hours. Total distance = 280 km, Total time = 5 hours. Average speed = 280 / 5 = 56 km/h.
Time for first section = 120 / 40 = 3 hours. Time for second section = 160 / 80 = 2 hours. Total distance = 280 km, Total time = 5 hours. Average speed = 280 / 5 = 56 km/h.
This question belongs to:
Maths
Time Speed and Distance
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