A train 130 meters long passing a platform 170 meters long takes 15 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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How long will a person take to walk around a square field of side 45 meters if his speed is 9 km/h?
Correct Answer: Option C
Explanation:
Perimeter of the square field = 4 * 45 = 180 meters. Speed = 9 km/h = 9 * (5/18) = 2.5 m/s. Time = Distance / Speed = 180 / 2.5 = 72 seconds.
Perimeter of the square field = 4 * 45 = 180 meters. Speed = 9 km/h = 9 * (5/18) = 2.5 m/s. Time = Distance / Speed = 180 / 2.5 = 72 seconds.
This question belongs to:
Maths
Time Speed and Distance
Question #2
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A car travels from A to B at 45 km/h and returns to A at 55 km/h. What is the approximate average speed for the round journey?
Correct Answer: Option B
Explanation:
Average Speed = 2xy / (x + y) = (2 * 45 * 55) / (45 + 55) = 4950 / 100 = 49.5 km/h.
Average Speed = 2xy / (x + y) = (2 * 45 * 55) / (45 + 55) = 4950 / 100 = 49.5 km/h.
This question belongs to:
Maths
Time Speed and Distance
Question #3
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A car covers a certain distance at 50 km/h. If the speed is increased to 75 km/h, it arrives 20 minutes earlier. Find the distance.
Correct Answer: Option B
Explanation:
Time difference = 20 minutes = 20/60 = 1/3 hour. Let distance be d. d / 50 - d / 75 = 1/3 => (3d - 2d) / 150 = 1/3 => d / 150 = 1/3 => d = 50 km.
Time difference = 20 minutes = 20/60 = 1/3 hour. Let distance be d. d / 50 - d / 75 = 1/3 => (3d - 2d) / 150 = 1/3 => d / 150 = 1/3 => d = 50 km.
This question belongs to:
Maths
Time Speed and Distance
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