A man rows upstream 10 km and downstream 22 km, taking 3 hours each way. Find the speed of the current. MCQ with Answer and Explanation
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Question #1
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A person row a distance of 16 km downstream in 2 hours and the same distance upstream in 4 hours. What is the speed of the boat in still water?
Correct Answer: Option B
Explanation:
Downstream speed = 16 / 2 = 8 km/h. Upstream speed = 16 / 4 = 4 km/h. Speed in still water = (8 + 4) / 2 = 6 km/h.
Downstream speed = 16 / 2 = 8 km/h. Upstream speed = 16 / 4 = 4 km/h. Speed in still water = (8 + 4) / 2 = 6 km/h.
This question belongs to:
Maths
Time Speed and Distance
Question #2
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A motorboat travels 24 km downstream in 2 hours and covers the same distance upstream in 3 hours. Find the speed of the current.
Correct Answer: Option B
Explanation:
Downstream speed = 24 / 2 = 12 km/h. Upstream speed = 24 / 3 = 8 km/h. Speed of current = (Downstream speed - Upstream speed) / 2 = (12 - 8) / 2 = 2 km/h.
Downstream speed = 24 / 2 = 12 km/h. Upstream speed = 24 / 3 = 8 km/h. Speed of current = (Downstream speed - Upstream speed) / 2 = (12 - 8) / 2 = 2 km/h.
This question belongs to:
Maths
Time Speed and Distance
Question #3
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A professional athlete tracks a loop of radius 140 meters in 88 seconds. What is his speed in km/h?
Correct Answer: Option D
Explanation:
Circumference of loop = 2 * (22/7) * 140 = 880 meters. Speed = 880 / 88 = 10 m/s. Converting to km/h = 10 * (18/5) = 36 km/h.
Circumference of loop = 2 * (22/7) * 140 = 880 meters. Speed = 880 / 88 = 10 m/s. Converting to km/h = 10 * (18/5) = 36 km/h.
This question belongs to:
Maths
Time Speed and Distance
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