The speed of a boat in still water is 16 km/h and the speed of the current is 4 km/h. How much distance can the boat cover upstream in 3 hours? MCQ with Answer and Explanation
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Question #1
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A train covers a distance between two stations in 45 minutes. If its speed is reduced by 5 km/h, it covers the same distance in 48 minutes. Find the distance between the two stations.
Correct Answer: Option B
Explanation:
Let initial speed be s. Distance is constant, so s * (45/60) = (s - 5) * (48/60) => 45s = 48s - 240 => 3s = 240 => s = 80 km/h. Distance = 80 * (45/60) = 60 km.
Let initial speed be s. Distance is constant, so s * (45/60) = (s - 5) * (48/60) => 45s = 48s - 240 => 3s = 240 => s = 80 km/h. Distance = 80 * (45/60) = 60 km.
This question belongs to:
Maths
Time Speed and Distance
Question #2
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A boy goes to school at a speed of 3 km/h and returns to his village at a speed of 2 km/h. If he takes 5 hours in all, what is the distance between the school and the village?
Correct Answer: Option A
Explanation:
Let distance be d. d/3 + d/2 = 5 => 5d/6 = 5 => d = 6 km.
Let distance be d. d/3 + d/2 = 5 => 5d/6 = 5 => d = 6 km.
This question belongs to:
Maths
Time Speed and Distance
Question #3
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A sound wave travels at 330 m/s. How long does it take to cover a distance of 6.6 km?
Correct Answer: Option C
Explanation:
Distance = 6.6 km = 6600 meters. Time taken = 6600 / 330 = 20 seconds.
Distance = 6.6 km = 6600 meters. Time taken = 6600 / 330 = 20 seconds.
This question belongs to:
Maths
Time Speed and Distance
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