A train 120 meters long running at 45 km/h crosses a bridge in 30 seconds. Find the length of the bridge. MCQ with Answer and Explanation
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Question #1
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A person covers a distance of 60 km at 15 km/h and another 40 km at 20 km/h. Find his average speed for the full journey.
Correct Answer: Option B
Explanation:
Total distance = 60 + 40 = 100 km. Time 1 = 60 / 15 = 4 hours. Time 2 = 40 / 20 = 2 hours. Total time = 6 hours. Average speed = 100 / 6 = 16.66 km/h.
Total distance = 60 + 40 = 100 km. Time 1 = 60 / 15 = 4 hours. Time 2 = 40 / 20 = 2 hours. Total time = 6 hours. Average speed = 100 / 6 = 16.66 km/h.
This question belongs to:
Maths
Time Speed and Distance
Question #2
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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 C
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
Question #3
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A boat moves upstream at a speed of 11 km/h and downstream at 16 km/h. Find the speed of the boat in still water.
Correct Answer: Option C
Explanation:
Speed in still water = (Downstream speed + Upstream speed) / 2 = (16 + 11) / 2 = 27 / 2 = 13.5 km/h.
Speed in still water = (Downstream speed + Upstream speed) / 2 = (16 + 11) / 2 = 27 / 2 = 13.5 km/h.
This question belongs to:
Maths
Time Speed and Distance
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