Two trains of equal length cross a pole in 12 seconds and 18 seconds respectively. If the length of each train is 180 meters, find the time taken by them to pass each other when running in opposite directions. MCQ with Answer and Explanation
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Question #1
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A runner covers a circular path of radius 70 meters in 44 seconds. What is his speed in km/h?
Correct Answer: Option A
Explanation:
Circumference of circular path = 2 * (22/7) * 70 = 440 meters. Speed = 440 / 44 = 10 m/s. In km/h = 10 * (18/5) = 36 km/h.
Circumference of circular path = 2 * (22/7) * 70 = 440 meters. Speed = 440 / 44 = 10 m/s. In km/h = 10 * (18/5) = 36 km/h.
This question belongs to:
Maths
Time Speed and Distance
Question #2
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A cyclist covers 500 meters in 2 minutes. What is his speed in km/h?
Correct Answer: Option D
Explanation:
Time = 2 minutes = 120 seconds. Speed = 500 / 120 = 25/6 m/s. In km/h = (25/6) * (18/5) = 5 * 3 = 15 km/h.
Time = 2 minutes = 120 seconds. Speed = 500 / 120 = 25/6 m/s. In km/h = (25/6) * (18/5) = 5 * 3 = 15 km/h.
This question belongs to:
Maths
Time Speed and Distance
Question #3
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Excluding stoppages, the speed of a train is 80 km/h and including stoppages, it is 60 km/h. For how many minutes does the train stop per hour?
Correct Answer: Option A
Explanation:
Stoppage time per hour = (Fast speed - Slow speed) / Fast speed = (80 - 60) / 80 = 20 / 80 = 1/4 hour. Converting to minutes = (1/4) * 60 = 15 minutes.
Stoppage time per hour = (Fast speed - Slow speed) / Fast speed = (80 - 60) / 80 = 20 / 80 = 1/4 hour. Converting to minutes = (1/4) * 60 = 15 minutes.
This question belongs to:
Maths
Time Speed and Distance
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