Two trains 110 meters and 90 meters long are running in opposite directions at speeds of 36 km/h and 54 km/h respectively. In what time will they pass each other completely? MCQ with Answer and Explanation
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Question #1
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A person travels a distance of 200 km at an average speed of 50 km/h and returns at a speed of 40 km/h. Find the average speed for the round trip.
Correct Answer: Option D
Explanation:
Average Speed = 2xy / (x + y) = (2 * 50 * 40) / (50 + 40) = 4000 / 90 = 44.44 km/h.
Average Speed = 2xy / (x + y) = (2 * 50 * 40) / (50 + 40) = 4000 / 90 = 44.44 km/h.
This question belongs to:
Maths
Time Speed and Distance
Question #2
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A sound wave maps a distance of 4080 meters between two hills in 12 seconds. Find the speed of sound.
Correct Answer: Option A
Explanation:
Speed of sound = Distance / Time = 4080 / 12 = 340 m/s.
Speed of sound = Distance / Time = 4080 / 12 = 340 m/s.
This question belongs to:
Maths
Time Speed and Distance
Question #3
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A train 125 meters long passes a running man in 10 seconds when both move in the same direction. If the speed of the man is 5 km/h, find the speed of the train.
Correct Answer: Option A
Explanation:
Relative speed = 125 / 10 = 12.5 m/s = (12.5) * (18/5) = 45 km/h. In the same direction, Relative Speed = Speed of train - Speed of man => 45 = Speed of train - 5 => Speed of train = 50 km/h.
Relative speed = 125 / 10 = 12.5 m/s = (12.5) * (18/5) = 45 km/h. In the same direction, Relative Speed = Speed of train - Speed of man => 45 = Speed of train - 5 => Speed of train = 50 km/h.
This question belongs to:
Maths
Time Speed and Distance
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