A train 100 meters long passes a static observer in 5 seconds. How long will it take to pass a platform 260 meters long? MCQ with Answer and Explanation
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Question #1
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A person walks from his residence to his office at 4 km/h and arrives 15 minutes late. If he increases his speed to 6 km/h, he still arrives 5 minutes late. Find the distance.
Correct Answer: Option A
Explanation:
Time difference = 15 - 5 = 10 minutes = 10 / 60 = 1/6 hour. Let distance be d. d/4 - d/6 = 1/6 => d/12 = 1/6 => d = 2 km.
Time difference = 15 - 5 = 10 minutes = 10 / 60 = 1/6 hour. Let distance be d. d/4 - d/6 = 1/6 => d/12 = 1/6 => d = 2 km.
This question belongs to:
Maths
Time Speed and Distance
Question #2
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A car covers a certain distance at 45 km/h. If it increases its speed to 60 km/h, it arrives 30 minutes earlier. Find the total distance.
Correct Answer: Option A
Explanation:
Time difference = 30 minutes = 0.5 hours. Let distance be d. d / 45 - d / 60 = 0.5 => (4d - 3d) / 180 = 0.5 => d / 180 = 0.5 => d = 90 km.
Time difference = 30 minutes = 0.5 hours. Let distance be d. d / 45 - d / 60 = 0.5 => (4d - 3d) / 180 = 0.5 => d / 180 = 0.5 => d = 90 km.
This question belongs to:
Maths
Time Speed and Distance
Question #3
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A car climbs a hill at 24 km/h and descends the same hill at 36 km/h. Find the average speed of the car for the entire journey.
Correct Answer: Option A
Explanation:
Average Speed = (2 * 24 * 36) / (24 + 36) = 1728 / 60 = 28.8 km/h.
Average Speed = (2 * 24 * 36) / (24 + 36) = 1728 / 60 = 28.8 km/h.
This question belongs to:
Maths
Time Speed and Distance
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