A train 180 meters long passes a static utility pole in 9 seconds. Find the time it takes to completely pass a platform of length 300 meters. MCQ with Answer and Explanation
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Question #1
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A man can row 6 km/h in still water. If the speed of the current is 2 km/h, it takes him 3 hours to row to a place and back. How far is the place?
Correct Answer: Option A
Explanation:
Downstream speed = 6 + 2 = 8 km/h. Upstream speed = 6 - 2 = 4 km/h. Let distance be d. d/8 + d/4 = 3 => (d + 2d)/8 = 3 => 3d/8 = 3 => d = 8 km.
Downstream speed = 6 + 2 = 8 km/h. Upstream speed = 6 - 2 = 4 km/h. Let distance be d. d/8 + d/4 = 3 => (d + 2d)/8 = 3 => 3d/8 = 3 => d = 8 km.
This question belongs to:
Maths
Time Speed and Distance
Question #2
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A missile travels at a speed of 1260 km/h. Find the distance covered by the missile in just 1 second.
Correct Answer: Option B
Explanation:
Speed in m/s = 1260 * (5/18) = 70 * 5 = 350 m/s. Therefore, distance covered in 1 second is 350 meters.
Speed in m/s = 1260 * (5/18) = 70 * 5 = 350 m/s. Therefore, distance covered in 1 second is 350 meters.
This question belongs to:
Maths
Time Speed and Distance
Question #3
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A boat can row 18 km/h in still water and the speed of the current is 2 km/h. Find the time taken to row 80 km downstream.
Correct Answer: Option B
Explanation:
Downstream speed = 18 + 2 = 20 km/h. Time taken = 80 / 20 = 4 hours.
Downstream speed = 18 + 2 = 20 km/h. Time taken = 80 / 20 = 4 hours.
This question belongs to:
Maths
Time Speed and Distance
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