A standard boat can row 12 km/h in still water. If the speed of the current is 2 km/h, find the time required to log 30 km upstream. MCQ with Answer and Explanation
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Question #1
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A passenger coach locomotive 200 meters long passes a clear roadside post marker in 10 seconds flat. Find the time needed to cross an extensions platform 440 meters long.
Correct Answer: Option B
Explanation:
Speed of coach locomotive = 200 / 10 = 20 m/s. Total distance to clear platform stretch = 200 + 440 = 640 meters. Time required = 640 / 20 = 32 seconds.
Speed of coach locomotive = 200 / 10 = 20 m/s. Total distance to clear platform stretch = 200 + 440 = 640 meters. Time required = 640 / 20 = 32 seconds.
This question belongs to:
Maths
Time Speed and Distance
Question #2
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A man covers 3/5 of his total journey by rail at 40 km/h and the remaining 2/5 by bus at 30 km/h. If the total distance is 150 km, what is the total time taken?
Correct Answer: Option C
Explanation:
Distance by rail = 150 * (3/5) = 90 km. Time by rail = 90 / 40 = 2.25 hours. Distance by bus = 150 - 90 = 60 km. Time by bus = 60 / 30 = 2 hours. Total time = 2.25 + 2 = 4.25 hours.
Distance by rail = 150 * (3/5) = 90 km. Time by rail = 90 / 40 = 2.25 hours. Distance by bus = 150 - 90 = 60 km. Time by bus = 60 / 30 = 2 hours. Total time = 2.25 + 2 = 4.25 hours.
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Maths
Time Speed and Distance
Question #3
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An airplane covers a certain distance at a speed of 240 km/h in 5 hours. To cover the same distance in 1 hour 40 minutes, it must travel at a speed of:
Correct Answer: Option B
Explanation:
Distance = Speed * Time = 240 * 5 = 1200 km. New time = 1 hour 40 minutes = 5/3 hours. New speed = Distance / New Time = 1200 / (5/3) = 1200 * 3 / 5 = 720 km/h.
Distance = Speed * Time = 240 * 5 = 1200 km. New time = 1 hour 40 minutes = 5/3 hours. New speed = Distance / New Time = 1200 / (5/3) = 1200 * 3 / 5 = 720 km/h.
This question belongs to:
Maths
Time Speed and Distance
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