A person can row 10 km/h in still water. If it takes him exactly twice as long to row upstream as to row downstream over the same stretch, find the speed of the current. MCQ with Answer and Explanation
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Question #1
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A worker handles a total factory delivery run of 160 km. He maps the first 60 km section at 30 km/h and the final 100 km segment section at 50 km/h. Find the mean average speed recorded across the full delivery run.
Correct Answer: Option D
Explanation:
Total distance = 160 km. Time for section 1 = 60 / 30 = 2 hours. Time for section 2 = 100 / 50 = 2 hours. Total duration time = 4 hours. Average speed across run = 160 / 4 = 40 km/h.
Total distance = 160 km. Time for section 1 = 60 / 30 = 2 hours. Time for section 2 = 100 / 50 = 2 hours. Total duration time = 4 hours. Average speed across run = 160 / 4 = 40 km/h.
This question belongs to:
Maths
Time Speed and Distance
Question #2
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Two trains 110 meters and 90 meters long are running in opposite directions at speeds of 36 km/h and 54 km/h respectively. In what time will they pass each other completely?
Correct Answer: Option C
Explanation:
Total distance = 110 + 90 = 200 meters. Relative speed in opposite directions = 36 + 54 = 90 km/h = 90 * (5/18) = 25 m/s. Time taken = 200 / 25 = 8 seconds.
Total distance = 110 + 90 = 200 meters. Relative speed in opposite directions = 36 + 54 = 90 km/h = 90 * (5/18) = 25 m/s. Time taken = 200 / 25 = 8 seconds.
This question belongs to:
Maths
Time Speed and Distance
Question #3
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A train 150 meters long completely passes a station pole sign in 6 seconds flat. Find its speed in km/h.
Correct Answer: Option D
Explanation:
Speed of train = 150 / 6 = 25 m/s. Converting to km/h = 25 * (18/5) = 90 km/h.
Speed of train = 150 / 6 = 25 m/s. Converting to km/h = 25 * (18/5) = 90 km/h.
This question belongs to:
Maths
Time Speed and Distance
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