A mechanical wheel has a radius of 7 cm. How many revolutions are required to cover a linear distance of 44 meters? MCQ with Answer and Explanation
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Question #1
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A train 160 meters long running at 54 km/h crosses a platform in 24 seconds. Find the length of the platform.
Correct Answer: Option A
Explanation:
Speed of train = 54 * (5/18) = 15 m/s. Total distance covered in 24 seconds = 15 * 24 = 360 meters. Platform length = 360 - 160 = 200 meters.
Speed of train = 54 * (5/18) = 15 m/s. Total distance covered in 24 seconds = 15 * 24 = 360 meters. Platform length = 360 - 160 = 200 meters.
This question belongs to:
Maths
Time Speed and Distance
Question #2
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A man covers 1/3rd of his journey at 20 km/h and the remaining 2/3rd at 40 km/h. If the total distance is 120 km, find the total time taken for the journey.
Correct Answer: Option A
Explanation:
First part distance = 120 / 3 = 40 km. Time1 = 40 / 20 = 2 hours. Remaining distance = 80 km. Time2 = 80 / 40 = 2 hours. Total time = 2 + 2 = 4 hours.
First part distance = 120 / 3 = 40 km. Time1 = 40 / 20 = 2 hours. Remaining distance = 80 km. Time2 = 80 / 40 = 2 hours. Total time = 2 + 2 = 4 hours.
This question belongs to:
Maths
Time Speed and Distance
Question #3
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A man rows a boat 20 km downstream in 2 hours and returns upstream in 5 hours. Find the speed of the stream.
Correct Answer: Option A
Explanation:
Downstream speed = 20 / 2 = 10 km/h. Upstream speed = 20 / 5 = 4 km/h. Speed of stream = (10 - 4) / 2 = 6 / 2 = 3 km/h.
Downstream speed = 20 / 2 = 10 km/h. Upstream speed = 20 / 5 = 4 km/h. Speed of stream = (10 - 4) / 2 = 6 / 2 = 3 km/h.
This question belongs to:
Maths
Time Speed and Distance
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