Walking at 4/5 of his normal pace, an editor reaches his office 15 minutes late. What is his exact normal time to reach the office? MCQ with Answer and Explanation
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Question #1
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A mechanical wheel has a radius of 7 cm. How many revolutions are required to cover a linear distance of 44 meters?
Correct Answer: Option D
Explanation:
Circumference of the wheel = 2 * (22/7) * 7 = 44 cm = 0.44 meters. Total distance = 44 meters. Number of revolutions = 44 / 0.44 = 100.
Circumference of the wheel = 2 * (22/7) * 7 = 44 cm = 0.44 meters. Total distance = 44 meters. Number of revolutions = 44 / 0.44 = 100.
This question belongs to:
Maths
Time Speed and Distance
Question #2
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A train 150 meters long is traveling at a speed of 45 km/h. How much time will it take to clear a platform 300 meters long?
Correct Answer: Option D
Explanation:
Total distance = 150 + 300 = 450 meters. Speed = 45 * (5/18) = 12.5 m/s. Time taken = 450 / 12.5 = 36 seconds.
Total distance = 150 + 300 = 450 meters. Speed = 45 * (5/18) = 12.5 m/s. Time taken = 450 / 12.5 = 36 seconds.
This question belongs to:
Maths
Time Speed and Distance
Question #3
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A person can row 10 km/h in still water. If the speed of the river current is 3 km/h, find the time taken to row 28 km upstream.
Correct Answer: Option D
Explanation:
Upstream speed = 10 - 3 = 7 km/h. Time taken = 28 / 7 = 4 hours.
Upstream speed = 10 - 3 = 7 km/h. Time taken = 28 / 7 = 4 hours.
This question belongs to:
Maths
Time Speed and Distance
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