A civilian covers a 2400-meter long walkway in exactly 8 minutes. Find his moving speed in km/h. MCQ with Answer and Explanation
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Question #1
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Two trains 140 meters and 160 meters long are running at the speeds of 60 km/h and 40 km/h respectively in opposite directions on parallel tracks. What is the time taken by them to cross each other completely?
Correct Answer: Option B
Explanation:
Total distance to be covered = 140 + 160 = 300 meters. Relative speed = 60 + 40 = 100 km/h = 100 * (5/18) = 250/9 m/s. Time = Distance / Speed = 300 / (250/9) = 300 * 9 / 250 = 10.8 seconds.
Total distance to be covered = 140 + 160 = 300 meters. Relative speed = 60 + 40 = 100 km/h = 100 * (5/18) = 250/9 m/s. Time = Distance / Speed = 300 / (250/9) = 300 * 9 / 250 = 10.8 seconds.
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Maths
Time Speed and Distance
Question #2
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A baseline boat hull can row 12 km/h in still water. If the river current tracks a velocity of 4 km/h, find the exact sector distance covered downstream by the boat hull in 45 minutes flat.
Correct Answer: Option B
Explanation:
Downstream speed = 12 + 4 = 16 km/h. Time = 45 minutes = 45/60 = 0.75 hours = 3/4 hour. Distance covered = Speed * Time = 16 * (3/4) = 12 km.
Downstream speed = 12 + 4 = 16 km/h. Time = 45 minutes = 45/60 = 0.75 hours = 3/4 hour. Distance covered = Speed * Time = 16 * (3/4) = 12 km.
This question belongs to:
Maths
Time Speed and Distance
Question #3
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A marathon runner runs a distance of 42 km at a uniform speed of 12 km/h. What is the time taken to finish the race?
Correct Answer: Option B
Explanation:
Time = Distance / Speed = 42 / 12 = 3.5 hours = 3 hours 30 minutes.
Time = Distance / Speed = 42 / 12 = 3.5 hours = 3 hours 30 minutes.
This question belongs to:
Maths
Time Speed and Distance
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