A boat can row 15 km/h in still water. If the river current flows at 3 km/h, find the distance covered by the boat downstream in 20 minutes. MCQ with Answer and Explanation
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Question #1
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A train 180 meters long running at 54 km/h passes a stationary point tracking observer. Find the time parameter required to cross.
Correct Answer: Option A
Explanation:
Speed of train = 54 * (5/18) = 15 m/s. Time taken = 180 / 15 = 12 seconds.
Speed of train = 54 * (5/18) = 15 m/s. Time taken = 180 / 15 = 12 seconds.
This question belongs to:
Maths
Time Speed and Distance
Question #2
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A track sprinter matches a 300-meter straight heat in 30 seconds. Find his moving speed in km/h.
Correct Answer: Option B
Explanation:
Speed in m/s = 300 / 30 = 10 m/s. In km/h = 10 * (18/5) = 36 km/h.
Speed in m/s = 300 / 30 = 10 m/s. In km/h = 10 * (18/5) = 36 km/h.
This question belongs to:
Maths
Time Speed and Distance
Question #3
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A man rows downstream 40 km in 4 hours and upstream 24 km in 4 hours. What is the speed of the stream?
Correct Answer: Option D
Explanation:
Downstream speed = 40 / 4 = 10 km/h. Upstream speed = 24 / 4 = 6 km/h. Speed of stream = (Downstream speed - Upstream speed) / 2 = (10 - 6) / 2 = 2 km/h.
Downstream speed = 40 / 4 = 10 km/h. Upstream speed = 24 / 4 = 6 km/h. Speed of stream = (Downstream speed - Upstream speed) / 2 = (10 - 6) / 2 = 2 km/h.
This question belongs to:
Maths
Time Speed and Distance
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