A train 120 meters long crosses a platform 280 meters long in 20 seconds. Find the speed of the train in km/h. MCQ with Answer and Explanation
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Question #1
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A boat moves upstream at a pace of 10 km/h and handles downstream at 16 km/h. Find the speed of the river current.
Correct Answer: Option D
Explanation:
Speed of river current = (Downstream speed - Upstream speed) / 2 = (16 - 10) / 2 = 6 / 2 = 3 km/h.
Speed of river current = (Downstream speed - Upstream speed) / 2 = (16 - 10) / 2 = 6 / 2 = 3 km/h.
This question belongs to:
Maths
Time Speed and Distance
Question #2
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A boatman rows 15 km downstream in 3 hours and 12 km upstream in 4 hours. What is the speed of the boat in still water?
Correct Answer: Option B
Explanation:
Downstream speed = 15 / 3 = 5 km/h. Upstream speed = 12 / 4 = 3 km/h. Speed in still water = (5 + 3) / 2 = 4 km/h.
Downstream speed = 15 / 3 = 5 km/h. Upstream speed = 12 / 4 = 3 km/h. Speed in still water = (5 + 3) / 2 = 4 km/h.
This question belongs to:
Maths
Time Speed and Distance
Question #3
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Two trains 120 meters and 180 meters long are running in opposite directions at speeds of 42 km/h and 48 km/h respectively. In what time will they cross each other?
Correct Answer: Option A
Explanation:
Total distance = 120 + 180 = 300 meters. Relative speed in opposite directions = 42 + 48 = 90 km/h = 25 m/s. Time taken = 300 / 25 = 12 seconds.
Total distance = 120 + 180 = 300 meters. Relative speed in opposite directions = 42 + 48 = 90 km/h = 25 m/s. Time taken = 300 / 25 = 12 seconds.
This question belongs to:
Maths
Time Speed and Distance
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