A wheel has a radius of 42 cm. How many revolutions must it make to cover a distance of 132 meters? MCQ with Answer and Explanation
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Question #1
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A train running at 72 km/h crosses a bridge 250 meters long in 20 seconds. Find the length of the train.
Correct Answer: Option C
Explanation:
Speed = 72 * (5/18) = 20 m/s. Total distance in 20 seconds = 20 * 20 = 400 meters. Length of train = 400 - 250 = 150 meters.
Speed = 72 * (5/18) = 20 m/s. Total distance in 20 seconds = 20 * 20 = 400 meters. Length of train = 400 - 250 = 150 meters.
This question belongs to:
Maths
Time Speed and Distance
Question #2
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A train 130 meters long passes a bridge of length 270 meters in 30 seconds. Find the speed of the train in km/h.
Correct Answer: Option A
Explanation:
Total distance = 130 + 270 = 400 meters. Speed = 400 / 30 = 40/3 m/s. In km/h = (40/3) * (18/5) = 8 * 6 = 48 km/h.
Total distance = 130 + 270 = 400 meters. Speed = 400 / 30 = 40/3 m/s. In km/h = (40/3) * (18/5) = 8 * 6 = 48 km/h.
This question belongs to:
Maths
Time Speed and Distance
Question #3
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A regular passenger bus tracks a route divided into three equal segments. It runs the segments at 20 km/h, 30 km/h, and 60 km/h respectively. Find the average speed across the whole route.
Correct Answer: Option A
Explanation:
Let each segment distance be 60 km. Total distance = 3 * 60 = 180 km. Total time = 60/20 + 60/30 + 60/60 = 3 + 2 + 1 = 6 hours. Average speed = 180 / 6 = 30 km/h.
Let each segment distance be 60 km. Total distance = 3 * 60 = 180 km. Total time = 60/20 + 60/30 + 60/60 = 3 + 2 + 1 = 6 hours. Average speed = 180 / 6 = 30 km/h.
This question belongs to:
Maths
Time Speed and Distance
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