A passenger train 100 meters long clears a line worker tracking on the ballast track in 5 seconds flat when both move along the identical direction. If the line worker walks at 8 km/h, find the train speed. MCQ with Answer and Explanation
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Question #1
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A boat can row 13 km/h in still water and the speed of the current is 3 km/h. Find the time taken to row 48 km downstream.
Correct Answer: Option C
Explanation:
Downstream speed = 13 + 3 = 16 km/h. Time taken = 48 / 16 = 3 hours.
Downstream speed = 13 + 3 = 16 km/h. Time taken = 48 / 16 = 3 hours.
This question belongs to:
Maths
Time Speed and Distance
Question #2
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The speed of a boat in still water is 14 km/h and the speed of the current is 4 km/h. How much time will the boat take to cover a distance of 72 km downstream?
Correct Answer: Option A
Explanation:
Downstream speed = Speed in still water + Speed of current = 14 + 4 = 18 km/h. Time taken = Distance / Downstream speed = 72 / 18 = 4 hours.
Downstream speed = Speed in still water + Speed of current = 14 + 4 = 18 km/h. Time taken = Distance / Downstream speed = 72 / 18 = 4 hours.
This question belongs to:
Maths
Time Speed and Distance
Question #3
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A man can row 5 km/h in still water. He takes 2.5 hours to row to a point and back when the current flows at 1 km/h. How far is the point?
Correct Answer: Option B
Explanation:
Downstream speed = 5 + 1 = 6 km/h. Upstream speed = 5 - 1 = 4 km/h. Let distance be d. d / 6 + d / 4 = 2.5 => 5d / 12 = 2.5 => 5d = 30 => d = 6 km.
Downstream speed = 5 + 1 = 6 km/h. Upstream speed = 5 - 1 = 4 km/h. Let distance be d. d / 6 + d / 4 = 2.5 => 5d / 12 = 2.5 => 5d = 30 => d = 6 km.
This question belongs to:
Maths
Time Speed and Distance
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