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. MCQ with Answer and Explanation
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Question #1
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A man rows a boat 30 km downstream in 3 hours and returns upstream in 6 hours. Find the speed of the stream.
Correct Answer: Option B
Explanation:
Downstream speed = 30 / 3 = 10 km/h. Upstream speed = 30 / 6 = 5 km/h. Speed of stream = (10 - 5) / 2 = 2.5 km/h.
Downstream speed = 30 / 3 = 10 km/h. Upstream speed = 30 / 6 = 5 km/h. Speed of stream = (10 - 5) / 2 = 2.5 km/h.
This question belongs to:
Maths
Time Speed and Distance
Question #2
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A runner tracks a circular field loop course of radius 70 meters. If his speed registers at 20 m/s, find the total loop rounds completed by him in 2 minutes 12 seconds.
Correct Answer: Option A
Explanation:
Circumference = 2 * (22/7) * 70 = 440 meters. Time = 2 minutes 12 seconds = 132 seconds. Total distance wrapped = Speed * Time = 20 * 132 = 2640 meters. Number of loop rounds completed = 2640 / 440 = 6 rounds.
Circumference = 2 * (22/7) * 70 = 440 meters. Time = 2 minutes 12 seconds = 132 seconds. Total distance wrapped = Speed * Time = 20 * 132 = 2640 meters. Number of loop rounds completed = 2640 / 440 = 6 rounds.
This question belongs to:
Maths
Time Speed and Distance
Question #3
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Two cars start from the same place at the same time in the same direction. The first car runs at a constant speed of 50 km/h and the second car runs at 60 km/h. What is the distance between them after 3 hours 30 minutes?
Correct Answer: Option A
Explanation:
Relative speed = 60 - 50 = 10 km/h. Time = 3.5 hours. Distance between them = Relative Speed * Time = 10 * 3.5 = 35 km.
Relative speed = 60 - 50 = 10 km/h. Time = 3.5 hours. Distance between them = Relative Speed * Time = 10 * 3.5 = 35 km.
This question belongs to:
Maths
Time Speed and Distance
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