A car runs at 60 km/h for 2 hours and then at 40 km/h for another 3 hours. Find the average speed of the car for the entire journey. MCQ with Answer and Explanation
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Question #1
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A train 120 meters long is running at a speed of 54 km/h. How long will it take to cross a platform 180 meters long?
Correct Answer: Option A
Explanation:
Speed of train = 54 * (5/18) = 15 m/s. Total distance = 120 + 180 = 300 meters. Time taken = 300 / 15 = 20 seconds.
Speed of train = 54 * (5/18) = 15 m/s. Total distance = 120 + 180 = 300 meters. Time taken = 300 / 15 = 20 seconds.
This question belongs to:
Maths
Time Speed and Distance
Question #2
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A train 180 meters long running at 54 km/h passes a stationary point tracking observer. Find the time parameter required to cross.
Correct Answer: Option C
Explanation:
Speed of train = 54 * (5/18) = 15 m/s. Time taken = 180 / 15 = 12 seconds.
Speed of train = 54 * (5/18) = 15 m/s. Time taken = 180 / 15 = 12 seconds.
This question belongs to:
Maths
Time Speed and Distance
Question #3
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A man can row 12 km/h in still water. He finds that it takes him twice as long to row upstream as to row downstream. Find the speed of the stream.
Correct Answer: Option C
Explanation:
Let stream speed be c. Upstream speed = 12 - c, Downstream speed = 12 + c. Given: 2 * (12 - c) = 12 + c => 24 - 2c = 12 + c => 3c = 12 => c = 4 km/h.
Let stream speed be c. Upstream speed = 12 - c, Downstream speed = 12 + c. Given: 2 * (12 - c) = 12 + c => 24 - 2c = 12 + c => 3c = 12 => c = 4 km/h.
This question belongs to:
Maths
Time Speed and Distance
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