Two trains 120 meters and 180 meters long are running in opposite directions at speeds of 42 km/h and 48 km/h respectively. In what time will they cross each other? MCQ with Answer and Explanation
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Question #1
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A man starts walking from a place P at 4 AM at a speed of 5 km/h. Another man starts from the same place P at 6 AM in the same direction at a speed of 7 km/h. At what time will they meet?
Correct Answer: Option A
Explanation:
By 6:00 AM, the first man has traveled for 2 hours, covering 5 * 2 = 10 km. Relative speed = 7 - 5 = 2 km/h. Time to meet = 10 / 2 = 5 hours. Meeting time = 6:00 AM + 5 hours = 11:00 AM.
By 6:00 AM, the first man has traveled for 2 hours, covering 5 * 2 = 10 km. Relative speed = 7 - 5 = 2 km/h. Time to meet = 10 / 2 = 5 hours. Meeting time = 6:00 AM + 5 hours = 11:00 AM.
This question belongs to:
Maths
Time Speed and Distance
Question #2
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Excluding stoppages, the speed of a train is 90 km/h and including stoppages it is 75 km/h. How many minutes does the train stop per hour?
Correct Answer: Option B
Explanation:
Stoppage time per hour = (90 - 75) / 90 = 15 / 90 = 1/6 hour. In minutes = (1/6) * 60 = 10 minutes.
Stoppage time per hour = (90 - 75) / 90 = 15 / 90 = 1/6 hour. In minutes = (1/6) * 60 = 10 minutes.
This question belongs to:
Maths
Time Speed and Distance
Question #3
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A train passes a static platform signal mast in 15 seconds and clears the 250-meter platform sector itself in 25 seconds. Find the length of the train.
Correct Answer: Option D
Explanation:
Time allocated to clear the platform alone = 25 - 15 = 10 seconds. Speed of train = 250 / 10 = 25 m/s. Length of train = Speed * Time to pass mast = 25 * 15 = 375 meters.
Time allocated to clear the platform alone = 25 - 15 = 10 seconds. Speed of train = 250 / 10 = 25 m/s. Length of train = Speed * Time to pass mast = 25 * 15 = 375 meters.
This question belongs to:
Maths
Time Speed and Distance
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