A motorboat covers 24 km downstream in 1.5 hours and covers the same distance upstream 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 sonic pulse registers a speed of 340 m/s. How many seconds will it take to span a straight distance line of 8.5 km?
Correct Answer: Option A
Explanation:
Distance = 8.5 km = 8500 meters. Time taken = 8500 / 340 = 25 seconds.
Distance = 8.5 km = 8500 meters. Time taken = 8500 / 340 = 25 seconds.
This question belongs to:
Maths
Time Speed and Distance
Question #2
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A motorboat covers a certain distance downstream in 4 hours and covers the same distance upstream in 5 hours. If the speed of the stream is 2 km/h, find the speed of the motorboat in still water.
Correct Answer: Option B
Explanation:
Let speed of boat in still water be v. Downstream speed = v + 2, Upstream speed = v - 4. Distance is same, so 4(v + 2) = 5(v - 2) => 4v + 8 = 5v - 10 => v = 18 km/h.
Let speed of boat in still water be v. Downstream speed = v + 2, Upstream speed = v - 4. Distance is same, so 4(v + 2) = 5(v - 2) => 4v + 8 = 5v - 10 => v = 18 km/h.
This question belongs to:
Maths
Time Speed and Distance
Question #3
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A sound wave maps a total line segment distance of 2.04 km in 6 seconds. Find the velocity of sound in m/s.
Correct Answer: Option B
Explanation:
Distance = 2.04 km = 2040 meters. Velocity = Distance / Time = 2040 / 6 = 340 m/s.
Distance = 2.04 km = 2040 meters. Velocity = Distance / Time = 2040 / 6 = 340 m/s.
This question belongs to:
Maths
Time Speed and Distance
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