A train 130 meters long passes a bridge of length 270 meters in 30 seconds. Find the speed of the train in km/h. MCQ with Answer and Explanation
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Question #1
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A delivery coach covers a highway stretch at 40 km/h. If the driver spikes the speed index to 60 km/h, the coach lands at the station terminal 15 minutes early. Find the track sector distance.
Correct Answer: Option C
Explanation:
Time difference = 15 minutes = 15/60 = 1/4 hours. Let distance be d. d / 40 - d / 60 = 1/4 => (3d - 2d) / 120 = 1/4 => d / 120 = 1/4 => d = 30 km.
Time difference = 15 minutes = 15/60 = 1/4 hours. Let distance be d. d / 40 - d / 60 = 1/4 => (3d - 2d) / 120 = 1/4 => d / 120 = 1/4 => d = 30 km.
This question belongs to:
Maths
Time Speed and Distance
Question #2
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A car travels from A to B at 40 km/h and returns to A at 60 km/h. What is the average speed for the round journey?
Correct Answer: Option B
Explanation:
Average Speed = 2xy / (x + y) = (2 * 40 * 60) / (40 + 60) = 4800 / 100 = 48 km/h.
Average Speed = 2xy / (x + y) = (2 * 40 * 60) / (40 + 60) = 4800 / 100 = 48 km/h.
This question belongs to:
Maths
Time Speed and Distance
Question #3
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A train passing a standing man takes 9 seconds, and it takes 21 seconds to pass a 240-meter long platform. Find the speed of the train in km/h.
Correct Answer: Option C
Explanation:
Time taken to cross the platform alone = 21 - 9 = 12 seconds. Speed of train = 240 / 12 = 20 m/s. In km/h = 20 * (18/5) = 72 km/h.
Time taken to cross the platform alone = 21 - 9 = 12 seconds. Speed of train = 240 / 12 = 20 m/s. In km/h = 20 * (18/5) = 72 km/h.
This question belongs to:
Maths
Time Speed and Distance
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