A crew can row 40 km downstream in 4 hours and 20 km 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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A commuter train passes a standing track post in 6 seconds flat. If the length of the train is 150 meters, find its speed in km/h.
Correct Answer: Option B
Explanation:
Speed = 150 / 6 = 25 m/s. In km/h = 25 * (18/5) = 90 km/h.
Speed = 150 / 6 = 25 m/s. In km/h = 25 * (18/5) = 90 km/h.
This question belongs to:
Maths
Time Speed and Distance
Question #2
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A cyclist covers a 3.6 km track in 12 minutes. Find his speed in meters per second.
Correct Answer: Option B
Explanation:
Distance = 3.6 km = 3600 meters. Time = 12 minutes = 720 seconds. Speed = 3600 / 720 = 5 m/s.
Distance = 3.6 km = 3600 meters. Time = 12 minutes = 720 seconds. Speed = 3600 / 720 = 5 m/s.
This question belongs to:
Maths
Time Speed and Distance
Question #3
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A truck covers 60 km at 30 km/h and then another 100 km at 50 km/h. Find the overall average speed for the full transit.
Correct Answer: Option A
Explanation:
Total distance = 60 + 100 = 160 km. Time for first leg = 60 / 30 = 2 hours. Time for second leg = 100 / 50 = 2 hours. Total time = 4 hours. Average speed = 160 / 4 = 40 km/h.
Total distance = 60 + 100 = 160 km. Time for first leg = 60 / 30 = 2 hours. Time for second leg = 100 / 50 = 2 hours. Total time = 4 hours. Average speed = 160 / 4 = 40 km/h.
This question belongs to:
Maths
Time Speed and Distance
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