An athlete loops a regular hexagonal field of side 50 meters. If his speed is 15 km/h, find the time taken to complete one full lap. MCQ with Answer and Explanation
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Question #1
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A runner covers a circular path of radius 70 meters in 44 seconds. What is his speed in km/h?
Correct Answer: Option C
Explanation:
Circumference of circular path = 2 * (22/7) * 70 = 440 meters. Speed = 440 / 44 = 10 m/s. In km/h = 10 * (18/5) = 36 km/h.
Circumference of circular path = 2 * (22/7) * 70 = 440 meters. Speed = 440 / 44 = 10 m/s. In km/h = 10 * (18/5) = 36 km/h.
This question belongs to:
Maths
Time Speed and Distance
Question #2
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Walking at 4/5 of his normal speed, a man is 12 minutes late. What is his usual time to cover the journey?
Correct Answer: Option C
Explanation:
New Time = 5/4 of usual time. Difference = 1/4 * Usual Time = 12 minutes => Usual Time = 48 minutes.
New Time = 5/4 of usual time. Difference = 1/4 * Usual Time = 12 minutes => Usual Time = 48 minutes.
This question belongs to:
Maths
Time Speed and Distance
Question #3
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The speed of a boat in still water is 15 km/h and the speed of the current is 3 km/h. How much distance can the boat cover upstream in exactly 3 hours?
Correct Answer: Option B
Explanation:
Upstream speed = 15 - 3 = 12 km/h. Distance covered in 3 hours = Upstream Speed * Time = 12 * 3 = 36 km.
Upstream speed = 15 - 3 = 12 km/h. Distance covered in 3 hours = Upstream Speed * Time = 12 * 3 = 36 km.
This question belongs to:
Maths
Time Speed and Distance
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