In a 400-meter race, A finishes in 45 seconds and B finishes in 50 seconds. By what distance does A beat B? MCQ with Answer and Explanation
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Question #1
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A wheel makes 2000 revolutions in covering a distance of 44 km. Find the radius of the wheel.
Correct Answer: Option B
Explanation:
Distance covered in 1 revolution = Total Distance / Number of Revolutions = 44000 meters / 2000 = 22 meters. Circumference = 2 * (22/7) * r = 22 => 44r / 7 = 22 => r = 154 / 44 = 3.5 meters.
Distance covered in 1 revolution = Total Distance / Number of Revolutions = 44000 meters / 2000 = 22 meters. Circumference = 2 * (22/7) * r = 22 => 44r / 7 = 22 => r = 154 / 44 = 3.5 meters.
This question belongs to:
Maths
Time Speed and Distance
Question #2
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A car covers a distance of 180 km in 3 hours. What should be the increase in its speed to cover the same distance in 2 hours?
Correct Answer: Option A
Explanation:
Original speed = 180 / 3 = 60 km/h. Required speed = 180 / 2 = 90 km/h. Increase = 90 - 60 = 30 km/h.
Original speed = 180 / 3 = 60 km/h. Required speed = 180 / 2 = 90 km/h. Increase = 90 - 60 = 30 km/h.
This question belongs to:
Maths
Time Speed and Distance
Question #3
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A person row a boat 12 km downstream in 1 hour. If the river current flows at 3 km/h, find the time taken by the boat to row the same distance upstream.
Correct Answer: Option A
Explanation:
Downstream speed = 12 / 1 = 12 km/h. Baseline boat speed in still water = Downstream speed - Current speed = 12 - 3 = 9 km/h. Upstream speed = Still water speed - Current speed = 9 - 3 = 6 km/h. Time taken upstream = Distance / Upstream speed = 12 / 6 = 2 hours.
Downstream speed = 12 / 1 = 12 km/h. Baseline boat speed in still water = Downstream speed - Current speed = 12 - 3 = 9 km/h. Upstream speed = Still water speed - Current speed = 9 - 3 = 6 km/h. Time taken upstream = Distance / Upstream speed = 12 / 6 = 2 hours.
This question belongs to:
Maths
Time Speed and Distance
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