A swimmer logs 36 km downstream in 3 hours and tracks the identical course line upstream in 9 hours. Find the net velocity of the stream. MCQ with Answer and Explanation
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Question #1
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A train 120 meters long running at 45 km/h crosses a bridge in 30 seconds. Find the length of the bridge.
Correct Answer: Option B
Explanation:
Speed of train = 45 * (5/18) = 12.5 m/s. Total distance covered in 30 seconds = 12.5 * 30 = 375 meters. Length of bridge = 375 - 120 = 255 meters.
Speed of train = 45 * (5/18) = 12.5 m/s. Total distance covered in 30 seconds = 12.5 * 30 = 375 meters. Length of bridge = 375 - 120 = 255 meters.
This question belongs to:
Maths
Time Speed and Distance
Question #2
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A bus runs at 40 km/h for 2 hours and 50 km/h for the next 3 hours. Find the average speed of the bus for the total journey.
Correct Answer: Option A
Explanation:
Distance 1 = 40 * 2 = 80 km. Distance 2 = 50 * 3 = 150 km. Total distance = 230 km. Total time = 2 + 3 = 5 hours. Average speed = 230 / 5 = 46 km/h.
Distance 1 = 40 * 2 = 80 km. Distance 2 = 50 * 3 = 150 km. Total distance = 230 km. Total time = 2 + 3 = 5 hours. Average speed = 230 / 5 = 46 km/h.
This question belongs to:
Maths
Time Speed and Distance
Question #3
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A suspect flees at 6:00 AM at a uniform speed of 50 km/h. The enforcement squad tracks pursuit at 7:00 AM at 60 km/h. At what time will the squad apprehend the suspect?
Correct Answer: Option A
Explanation:
By 7:00 AM, the suspect has traveled for 1 hour and covered 50 km. Relative tracking speed = 60 - 50 = 10 km/h. Time taken to catch = 50 / 10 = 5 hours. Apprehension time = 7:00 AM + 5 hours = 12:00 PM.
By 7:00 AM, the suspect has traveled for 1 hour and covered 50 km. Relative tracking speed = 60 - 50 = 10 km/h. Time taken to catch = 50 / 10 = 5 hours. Apprehension time = 7:00 AM + 5 hours = 12:00 PM.
This question belongs to:
Maths
Time Speed and Distance
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