A person crosses a 500-meter long bridge in 4 minutes. Find his speed in km/h. MCQ with Answer and Explanation
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Question #1
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A luxury car handles a tracking route sector of 240 km. It finishes the first half segment stretch at 40 km/h and the second half sector at 60 km/h. Find the mean average speed recorded across the full route.
Correct Answer: Option A
Explanation:
Average Speed across sectors = 2xy / (x + y) = (2 * 40 * 60) / (40 + 60) = 4800 / 100 = 48 km/h.
Average Speed across sectors = 2xy / (x + y) = (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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How long will a person take to walk around a square field of side 45 meters if his speed is 9 km/h?
Correct Answer: Option A
Explanation:
Perimeter of the square field = 4 * 45 = 180 meters. Speed = 9 km/h = 9 * (5/18) = 2.5 m/s. Time = Distance / Speed = 180 / 2.5 = 72 seconds.
Perimeter of the square field = 4 * 45 = 180 meters. Speed = 9 km/h = 9 * (5/18) = 2.5 m/s. Time = Distance / Speed = 180 / 2.5 = 72 seconds.
This question belongs to:
Maths
Time Speed and Distance
Question #3
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A man rows downstream 36 km in 3 hours and upstream 18 km in 3 hours. Find the speed of the boat in still water.
Correct Answer: Option B
Explanation:
Downstream speed = 36 / 3 = 12 km/h. Upstream speed = 18 / 3 = 6 km/h. Speed in still water = (12 + 6) / 2 = 9 km/h.
Downstream speed = 36 / 3 = 12 km/h. Upstream speed = 18 / 3 = 6 km/h. Speed in still water = (12 + 6) / 2 = 9 km/h.
This question belongs to:
Maths
Time Speed and Distance
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