A passenger train 140 meters long passes an active bridge platform 310 meters long in 20 seconds. What is the speed of the train in km/h? MCQ with Answer and Explanation
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Question #1
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Two boys start running from the same point in the same direction along a circular track at speeds of 5 m/s and 8 m/s. If the track length is 400 meters, after how much time will they meet for the first time?
Correct Answer: Option A
Explanation:
Relative speed = 8 - 5 = 3 m/s. Time to meet for the first time = Circumference / Relative speed = 400 / 3 = 133.33 seconds.
Relative speed = 8 - 5 = 3 m/s. Time to meet for the first time = Circumference / Relative speed = 400 / 3 = 133.33 seconds.
This question belongs to:
Maths
Time Speed and Distance
Question #2
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A person runs a distance of 1200 meters along a straight road in 4 minutes. What is his speed in km/h?
Correct Answer: Option A
Explanation:
Time = 4 minutes = 240 seconds. Speed = 1200 / 240 = 5 m/s. Speed in km/h = 5 * (18/5) = 18 km/h.
Time = 4 minutes = 240 seconds. Speed = 1200 / 240 = 5 m/s. Speed in km/h = 5 * (18/5) = 18 km/h.
This question belongs to:
Maths
Time Speed and Distance
Question #3
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A person row a boat 45 km downstream in 3 hours and manages the return journey upstream in 9 hours. Find the speed of the river current.
Correct Answer: Option B
Explanation:
Downstream speed = 45 / 3 = 15 km/h. Upstream speed = 45 / 9 = 5 km/h. Speed of current = (15 - 5) / 2 = 10 / 2 = 5 km/h.
Downstream speed = 45 / 3 = 15 km/h. Upstream speed = 45 / 9 = 5 km/h. Speed of current = (15 - 5) / 2 = 10 / 2 = 5 km/h.
This question belongs to:
Maths
Time Speed and Distance
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