A man rows downstream 28 km in 2 hours and upstream 12 km in 2 hours. Find the speed of the current. MCQ with Answer and Explanation
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Question #1
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A real estate agent drives from his house to an office at 10 km/h and arrives 12 minutes late. If he increases his speed to 15 km/h, he arrives 4 minutes early. Find the distance.
Correct Answer: Option B
Explanation:
Time difference = 12 - (-4) = 16 minutes = 16/60 = 4/15 hours. Let distance be d. d/10 - d/15 = 4/15 => (3d - 2d) / 30 = 4/15 => d / 30 = 4/15 => d = 8 km.
Time difference = 12 - (-4) = 16 minutes = 16/60 = 4/15 hours. Let distance be d. d/10 - d/15 = 4/15 => (3d - 2d) / 30 = 4/15 => d / 30 = 4/15 => d = 8 km.
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Maths
Time Speed and Distance
Question #2
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A cartwheel has a radius of 35 cm. How many revolutions must it make to cover a total distance of 1100 meters?
Correct Answer: Option B
Explanation:
Circumference = 2 * (22/7) * 35 = 220 cm = 2.2 meters. Total distance = 1100 meters. Number of revolutions = 1100 / 2.2 = 500.
Circumference = 2 * (22/7) * 35 = 220 cm = 2.2 meters. Total distance = 1100 meters. Number of revolutions = 1100 / 2.2 = 500.
This question belongs to:
Maths
Time Speed and Distance
Question #3
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A man walks at a speed of 6 km/h instead of 5 km/h and thereby covers 12 km more in the same duration. Find the actual distance covered by him at his normal speed.
Correct Answer: Option C
Explanation:
Let duration be t hours. Distance difference = 6t - 5t = t = 12 hours. Distance at normal speed (5 km/h) = 5 * 12 = 60 km.
Let duration be t hours. Distance difference = 6t - 5t = t = 12 hours. Distance at normal speed (5 km/h) = 5 * 12 = 60 km.
This question belongs to:
Maths
Time Speed and Distance
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