Walking at 5/6 of his baseline speed, an officer reaches his desk 12 minutes late. What is his baseline typical time? MCQ with Answer and Explanation
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Question #1
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A train 200 meters long covers a telegraph post in 10 seconds. Find the time it takes to cover a bridge of 300 meters.
Correct Answer: Option C
Explanation:
Speed of train = 200 / 10 = 20 m/s. Total distance to cross bridge = 200 + 300 = 500 meters. Time = 500 / 20 = 25 seconds.
Speed of train = 200 / 10 = 20 m/s. Total distance to cross bridge = 200 + 300 = 500 meters. Time = 500 / 20 = 25 seconds.
This question belongs to:
Maths
Time Speed and Distance
Question #2
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A person covers 1/3 of a distance at 20 km/h, 1/3 at 30 km/h and the last 1/3 at 60 km/h. Find the average speed.
Correct Answer: Option B
Explanation:
Let each third of the distance be 60 km. Total distance = 180 km. Total time taken = 60/20 + 60/30 + 60/60 = 3 + 2 + 1 = 6 hours. Average speed = 180 / 6 = 30 km/h.
Let each third of the distance be 60 km. Total distance = 180 km. Total time taken = 60/20 + 60/30 + 60/60 = 3 + 2 + 1 = 6 hours. Average speed = 180 / 6 = 30 km/h.
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Maths
Time Speed and Distance
Question #3
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Excluding stoppages, the speed of a bus is 54 km/h and including stoppages, it is 45 km/h. For how many minutes does the bus stop per hour?
Correct Answer: Option A
Explanation:
Stoppage time per hour = (Fast Speed - Slow Speed) / Fast Speed = (54 - 45) / 54 = 9 / 54 = 1/6 hour. In minutes = (1/6) * 60 = 10 minutes.
Stoppage time per hour = (Fast Speed - Slow Speed) / Fast Speed = (54 - 45) / 54 = 9 / 54 = 1/6 hour. In minutes = (1/6) * 60 = 10 minutes.
This question belongs to:
Maths
Time Speed and Distance
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