A boat can row 10 km/h in still water. If the river velocity is 2 km/h, find the distance covered downstream by the boat in 30 minutes. MCQ with Answer and Explanation
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Question #1
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A person walks from his house to office at 5 km/h and arrives 12 minutes late. If he walks at 6 km/h, he arrives 2 minutes late. Find the distance.
Correct Answer: Option D
Explanation:
Time difference = 12 - 2 = 10 minutes = 10/60 = 1/6 hours. Let distance be d. d / 5 - d / 6 = 1/6 => d / 30 = 1/6 => d = 5 km.
Time difference = 12 - 2 = 10 minutes = 10/60 = 1/6 hours. Let distance be d. d / 5 - d / 6 = 1/6 => d / 30 = 1/6 => d = 5 km.
This question belongs to:
Maths
Time Speed and Distance
Question #2
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A person walking at 4 km/h covers a certain distance. If he runs at 8 km/h, he takes 30 minutes less to cover the same distance. Find the distance.
Correct Answer: Option D
Explanation:
Time difference = 30 minutes = 0.5 hours. Let distance be d. d / 4 - d / 8 = 0.5 => d / 8 = 0.5 => d = 4 km.
Time difference = 30 minutes = 0.5 hours. Let distance be d. d / 4 - d / 8 = 0.5 => d / 8 = 0.5 => d = 4 km.
This question belongs to:
Maths
Time Speed and Distance
Question #3
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A car covers a certain distance at an average speed of 60 km/h in 4 hours. At what speed must it travel to cover the same distance in 3 hours?
Correct Answer: Option B
Explanation:
Distance = 60 * 4 = 240 km. New required speed = 240 / 3 = 80 km/h.
Distance = 60 * 4 = 240 km. New required speed = 240 / 3 = 80 km/h.
This question belongs to:
Maths
Time Speed and Distance
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