A train covers a distance of 10 km in 12 minutes. If its speed is decreased by 5 km/h, what will be the time taken by it to cover the same distance? MCQ with Answer and Explanation
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Question #1
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A train passes a platform 110 meters long in 40 seconds and a boy standing on the platform in 30 seconds. Find the length of the train.
Correct Answer: Option C
Explanation:
Let length of train be L. Speed = L/30. Also, Speed = (L+110)/40. So L/30 = (L+110)/40 => 4L = 3L + 330 => L = 330 meters.
Let length of train be L. Speed = L/30. Also, Speed = (L+110)/40. So L/30 = (L+110)/40 => 4L = 3L + 330 => L = 330 meters.
This question belongs to:
Maths
Time Speed and Distance
Question #2
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A runner covers a 400-meter track. The winner finishes in 40 seconds, while the runner-up takes 44 seconds. By what distance does the winner beat the runner-up?
Correct Answer: Option B
Explanation:
Speed of runner-up = 400 / 44 = 100 / 11 m/s. Distance covered by runner-up in 40 seconds = (100 / 11) * 40 = 4000 / 11 = 363.63 meters. Winning margin = 400 - 363.63 = 36.36 meters.
Speed of runner-up = 400 / 44 = 100 / 11 m/s. Distance covered by runner-up in 40 seconds = (100 / 11) * 40 = 4000 / 11 = 363.63 meters. Winning margin = 400 - 363.63 = 36.36 meters.
This question belongs to:
Maths
Time Speed and Distance
Question #3
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A sound wave travels at 340 m/s. How much distance in kilometers does it cover in exactly 15 seconds?
Correct Answer: Option A
Explanation:
Distance = Speed * Time = 340 * 15 = 5100 meters. Converting to kilometers = 5100 / 1000 = 5.1 km.
Distance = Speed * Time = 340 * 15 = 5100 meters. Converting to kilometers = 5100 / 1000 = 5.1 km.
This question belongs to:
Maths
Time Speed and Distance
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