A train 160 meters long crosses a pole in 8 seconds. What is its speed in km/h? MCQ with Answer and Explanation
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Question #1
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A boat covers 30 km downstream in 3 hours and the same distance upstream in 6 hours. Find the speed of the stream.
Correct Answer: Option D
Explanation:
Downstream speed = 30 / 3 = 10 km/h. Upstream speed = 30 / 6 = 5 km/h. Speed of stream = (10 - 5) / 2 = 5 / 2 = 2.5 km/h.
Downstream speed = 30 / 3 = 10 km/h. Upstream speed = 30 / 6 = 5 km/h. Speed of stream = (10 - 5) / 2 = 5 / 2 = 2.5 km/h.
This question belongs to:
Maths
Time Speed and Distance
Question #2
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A motor car finishes a journey in 10 hours. The first half is covered at 42 km/h and the second half at 48 km/h. Find the total distance of the journey.
Correct Answer: Option D
Explanation:
Let half distance be d. d/42 + d/48 = 10 => (8d + 7d)/336 = 10 => 15d = 3360 => d = 224 km. Total distance = 2d = 448 km.
Let half distance be d. d/42 + d/48 = 10 => (8d + 7d)/336 = 10 => 15d = 3360 => d = 224 km. Total distance = 2d = 448 km.
This question belongs to:
Maths
Time Speed and Distance
Question #3
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A train passes a static milepost in exactly 7 seconds. If the speed of the train is 72 km/h, find the absolute length of the train.
Correct Answer: Option C
Explanation:
Speed of train = 72 * (5/18) = 20 m/s. Length of train = Speed * Time = 20 * 7 = 140 meters.
Speed of train = 72 * (5/18) = 20 m/s. Length of train = Speed * Time = 20 * 7 = 140 meters.
This question belongs to:
Maths
Time Speed and Distance
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