A person row a boat 16 km upstream in 4 hours. If the speed of the current is 1 km/h, find the speed of the boat in still water. MCQ with Answer and Explanation
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Question #1
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A train 120 meters long passes a track worker walking at 6 km/h in the same direction in 12 seconds. What is the actual speed of the train?
Correct Answer: Option B
Explanation:
Relative speed = 120 / 12 = 10 m/s = 10 * (18/5) = 36 km/h. Since they move in the same direction, Relative Speed = Speed of train - Speed of worker => 36 = Speed of train - 6 => Speed of train = 42 km/h.
Relative speed = 120 / 12 = 10 m/s = 10 * (18/5) = 36 km/h. Since they move in the same direction, Relative Speed = Speed of train - Speed of worker => 36 = Speed of train - 6 => Speed of train = 42 km/h.
This question belongs to:
Maths
Time Speed and Distance
Question #2
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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 D
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
Question #3
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A train cross a pole in 12 seconds. If the speed of the train is 72 km/h, what is the length of the train?
Correct Answer: Option C
Explanation:
Speed = 72 * (5/18) = 20 m/s. Length = Speed * Time = 20 * 12 = 240 meters.
Speed = 72 * (5/18) = 20 m/s. Length = Speed * Time = 20 * 12 = 240 meters.
This question belongs to:
Maths
Time Speed and Distance
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