A man rows a boat 18 km in 4 hours downstream and returns upstream in 12 hours. Find the speed of the stream. MCQ with Answer and Explanation
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Question #1
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A man rows a distance of 12 km downstream in 1.5 hours and returns upstream in 3 hours. Find the speed of the river current.
Correct Answer: Option C
Explanation:
Downstream speed = 12 / 1.5 = 8 km/h. Upstream speed = 12 / 3 = 4 km/h. Speed of current = (8 - 4) / 2 = 4 / 2 = 2 km/h.
Downstream speed = 12 / 1.5 = 8 km/h. Upstream speed = 12 / 3 = 4 km/h. Speed of current = (8 - 4) / 2 = 4 / 2 = 2 km/h.
This question belongs to:
Maths
Time Speed and Distance
Question #2
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A train 160 meters long passes a standing man in 8 seconds. What is the speed of the train?
Correct Answer: Option B
Explanation:
Speed = 160 / 8 = 20 m/s. In km/h = 20 * (18/5) = 72 km/h.
Speed = 160 / 8 = 20 m/s. In km/h = 20 * (18/5) = 72 km/h.
This question belongs to:
Maths
Time Speed and Distance
Question #3
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A marathon runner runs a distance of 42 km at a uniform speed of 12 km/h. What is the time taken to finish the race?
Correct Answer: Option D
Explanation:
Time = Distance / Speed = 42 / 12 = 3.5 hours = 3 hours 30 minutes.
Time = Distance / Speed = 42 / 12 = 3.5 hours = 3 hours 30 minutes.
This question belongs to:
Maths
Time Speed and Distance
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