A boat covers 20 km downstream in 2 hours and the same distance upstream in 5 hours. Find the speed of the stream. MCQ with Answer and Explanation
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Question #1
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Two express trains 220 meters and 180 meters long are tracking parallel in identical directions at speeds of 90 km/h and 72 km/h. Find the duration to pass each other.
Correct Answer: Option A
Explanation:
Total distance = 220 + 180 = 400 meters. Relative speed in identical direction = 90 - 72 = 18 km/h = 5 m/s. Time taken = 400 / 5 = 80 seconds.
Total distance = 220 + 180 = 400 meters. Relative speed in identical direction = 90 - 72 = 18 km/h = 5 m/s. Time taken = 400 / 5 = 80 seconds.
This question belongs to:
Maths
Time Speed and Distance
Question #2
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A boatman rows 1 km in 5 minutes along the stream and 1 km in 12 minutes against the stream. Find the speed of the stream.
Correct Answer: Option D
Explanation:
Downstream speed = 1 km / (5/60 hours) = 12 km/h. Upstream speed = 1 km / (12/60 hours) = 5 km/h. Speed of stream = (Downstream speed - Upstream speed) / 2 = (12 - 5) / 2 = 3.5 km/h.
Downstream speed = 1 km / (5/60 hours) = 12 km/h. Upstream speed = 1 km / (12/60 hours) = 5 km/h. Speed of stream = (Downstream speed - Upstream speed) / 2 = (12 - 5) / 2 = 3.5 km/h.
This question belongs to:
Maths
Time Speed and Distance
Question #3
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A train passes a standing passenger in 8 seconds and crosses a 180-meter long platform in 17 seconds. Find the speed of the train.
Correct Answer: Option B
Explanation:
Time taken to pass the platform alone = 17 - 8 = 9 seconds. Speed of train = 180 / 9 = 20 m/s.
Time taken to pass the platform alone = 17 - 8 = 9 seconds. Speed of train = 180 / 9 = 20 m/s.
This question belongs to:
Maths
Time Speed and Distance
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