A boatman can row 4.5 km/h in still water. If the river flows at 1.5 km/h, it takes him 2 hours to row to a place and come back. How far is the place? MCQ with Answer and Explanation
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Question #1
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A man can walk at 6 km/h. After every kilometer, he takes a rest of 6 minutes. How much time will he take to cover a distance of 18 km?
Correct Answer: Option A
Explanation:
Pure walking time = 18 / 6 = 3 hours. Number of rest intervals = 18 - 1 = 17 intervals. Total rest time = 17 * 6 = 102 minutes = 1 hour 42 minutes. Total time = 3 hours + 1 hour 42 minutes = 4 hours 42 minutes.
Pure walking time = 18 / 6 = 3 hours. Number of rest intervals = 18 - 1 = 17 intervals. Total rest time = 17 * 6 = 102 minutes = 1 hour 42 minutes. Total time = 3 hours + 1 hour 42 minutes = 4 hours 42 minutes.
This question belongs to:
Maths
Time Speed and Distance
Question #2
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A man walks a certain distance at 5 km/h and runs back at 15 km/h. What is his average speed for the entire journey?
Correct Answer: Option B
Explanation:
Average Speed = (2 * 5 * 15) / (5 + 15) = 150 / 20 = 7.5 km/h.
Average Speed = (2 * 5 * 15) / (5 + 15) = 150 / 20 = 7.5 km/h.
This question belongs to:
Maths
Time Speed and Distance
Question #3
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A train 150 meters long takes 20 seconds to cross a platform 250 meters long. Find the speed of the train in km/h.
Correct Answer: Option A
Explanation:
Total distance = 150 + 250 = 400 meters. Time = 20 seconds. Speed = 400 / 20 = 20 m/s. Speed in km/h = 20 * (18/5) = 72 km/h.
Total distance = 150 + 250 = 400 meters. Time = 20 seconds. Speed = 400 / 20 = 20 m/s. Speed in km/h = 20 * (18/5) = 72 km/h.
This question belongs to:
Maths
Time Speed and Distance
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