A vehicle runs at 30 km/h for 3 hours and 60 km/h for the next 2 hours. Find the average speed for the whole journey. MCQ with Answer and Explanation
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Question #1
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A delivery van driver walks at 5 km/h and arrives 12 minutes late at his drop station. If he tracks at 8 km/h, he reaches 3 minutes early. Find the sector distance.
Correct Answer: Option A
Explanation:
Time difference = 12 - (-3) = 15 minutes = 1/4 hours. Let distance be d. d/5 - d/8 = 1/4 => 3d/40 = 1/4 => 3d = 10 => d = 3.33 km.
Time difference = 12 - (-3) = 15 minutes = 1/4 hours. Let distance be d. d/5 - d/8 = 1/4 => 3d/40 = 1/4 => 3d = 10 => d = 3.33 km.
This question belongs to:
Maths
Time Speed and Distance
Question #2
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A vehicle runs at an average speed of 54 km/h. It wraps the first half of the trip duration in 2 hours and the second half duration at 66 km/h. Find the time spent on the second half duration.
Correct Answer: Option D
Explanation:
Since it specifies 'half of the trip duration', the time for both halves is identical. Time spent on the second half is equal to the first half, which is 2 hours.
Since it specifies 'half of the trip duration', the time for both halves is identical. Time spent on the second half is equal to the first half, which is 2 hours.
This question belongs to:
Maths
Time Speed and Distance
Question #3
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A train traveling at 60 km/h crosses a static tunnel in 18 seconds. If the length of the train is 120 meters, find the length of the tunnel.
Correct Answer: Option C
Explanation:
Speed of train = 60 * (5/18) = 50/3 m/s. Total distance covered in 18 seconds = (50/3) * 18 = 300 meters. Length of tunnel = 300 - 120 = 180 meters.
Speed of train = 60 * (5/18) = 50/3 m/s. Total distance covered in 18 seconds = (50/3) * 18 = 300 meters. Length of tunnel = 300 - 120 = 180 meters.
This question belongs to:
Maths
Time Speed and Distance
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