A worker covers 40% of his path at 20 km/h and the remaining 60% at 30 km/h. Find his average speed for the full journey. MCQ with Answer and Explanation
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Question #1
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A cyclist covers a 3.6 km track in 12 minutes. Find his speed in meters per second.
Correct Answer: Option D
Explanation:
Distance = 3.6 km = 3600 meters. Time = 12 minutes = 720 seconds. Speed = 3600 / 720 = 5 m/s.
Distance = 3.6 km = 3600 meters. Time = 12 minutes = 720 seconds. Speed = 3600 / 720 = 5 m/s.
This question belongs to:
Maths
Time Speed and Distance
Question #2
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A sound wave travels at 330 m/s. How long does it take to cover a distance of 6.6 km?
Correct Answer: Option A
Explanation:
Distance = 6.6 km = 6600 meters. Time taken = 6600 / 330 = 20 seconds.
Distance = 6.6 km = 6600 meters. Time taken = 6600 / 330 = 20 seconds.
This question belongs to:
Maths
Time Speed and Distance
Question #3
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Two trains 120 meters and 130 meters long are running in opposite directions at speeds of 45 km/h and 45 km/h respectively. In what time will they cross each other?
Correct Answer: Option B
Explanation:
Total distance = 120 + 130 = 250 meters. Relative speed in opposite directions = 45 + 45 = 90 km/h = 25 m/s. Time taken = 250 / 25 = 10 seconds.
Total distance = 120 + 130 = 250 meters. Relative speed in opposite directions = 45 + 45 = 90 km/h = 25 m/s. Time taken = 250 / 25 = 10 seconds.
This question belongs to:
Maths
Time Speed and Distance
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