A locomotive train 140 meters long passes a track milestone pole in 7 seconds flat. What is its speed in km/h? MCQ with Answer and Explanation
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Question #1
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Two cities A and B are 360 km apart. A car goes from A to B at 40 km/h and returns to A at 60 km/h. Find the average speed of the car.
Correct Answer: Option B
Explanation:
Average speed = (2 * 40 * 60) / (40 + 60) = 4800 / 100 = 48 km/h.
Average speed = (2 * 40 * 60) / (40 + 60) = 4800 / 100 = 48 km/h.
This question belongs to:
Maths
Time Speed and Distance
Question #2
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A boatman can row 4.5 km/h in still water. If the river flows at 1.5 km/h, it takes him 2 hours to row to a place and come back. How far is the place?
Correct Answer: Option D
Explanation:
Downstream speed = 4.5 + 1.5 = 6 km/h. Upstream speed = 4.5 - 1.5 = 3 km/h. Let distance be d. d/6 + d/3 = 2 => 3d/6 = 2 => d/2 = 2 => d = 4 km.
Downstream speed = 4.5 + 1.5 = 6 km/h. Upstream speed = 4.5 - 1.5 = 3 km/h. Let distance be d. d/6 + d/3 = 2 => 3d/6 = 2 => d/2 = 2 => d = 4 km.
This question belongs to:
Maths
Time Speed and Distance
Question #3
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A boat can row 8 km/h in still water. If the river velocity is 4 km/h, find the distance covered downstream by the boat in 45 minutes.
Correct Answer: Option B
Explanation:
Downstream speed = 8 + 4 = 12 km/h. Time = 45 minutes = 45/60 = 3/4 hour. Distance covered = Speed * Time = 12 * (3/4) = 9 km.
Downstream speed = 8 + 4 = 12 km/h. Time = 45 minutes = 45/60 = 3/4 hour. Distance covered = Speed * Time = 12 * (3/4) = 9 km.
This question belongs to:
Maths
Time Speed and Distance
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