A swimmer registers 12 km upstream and 24 km downstream, taking 3 hours for each leg of the trials. Find the speed of the current stream. MCQ with Answer and Explanation
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Question #1
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Walking at 3/4 of his normal speed, a person is 10 minutes late to his destination. What is his normal time?
Correct Answer: Option D
Explanation:
New speed = 3/4 of normal speed => New time = 4/3 of normal time. Difference = 1/3 of normal time = 10 minutes. Normal time = 10 * 3 = 30 minutes.
New speed = 3/4 of normal speed => New time = 4/3 of normal time. Difference = 1/3 of normal time = 10 minutes. Normal time = 10 * 3 = 30 minutes.
This question belongs to:
Maths
Time Speed and Distance
Question #2
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A person walks from his home to his office at 3 km/h and reaches 15 minutes late. If he walks at 4 km/h, he reaches 5 minutes late. Find the distance.
Correct Answer: Option A
Explanation:
Time difference = 15 - 5 = 10 minutes = 10/60 = 1/6 hour. Let distance be d. d / 3 - d / 4 = 1/6 => d / 12 = 1/6 => d = 2 km.
Time difference = 15 - 5 = 10 minutes = 10/60 = 1/6 hour. Let distance be d. d / 3 - d / 4 = 1/6 => d / 12 = 1/6 => d = 2 km.
This question belongs to:
Maths
Time Speed and Distance
Question #3
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A person walking at 3 km/h covers a certain distance. If he runs at 9 km/h, he takes 40 minutes less to cover the same distance. Find the distance.
Correct Answer: Option D
Explanation:
Time difference = 40 minutes = 40/60 = 2/3 hours. Let distance be d. d / 3 - d / 9 = 2/3 => 2d / 9 = 2/3 => 2d = 6 => d = 3 km.
Time difference = 40 minutes = 40/60 = 2/3 hours. Let distance be d. d / 3 - d / 9 = 2/3 => 2d / 9 = 2/3 => 2d = 6 => d = 3 km.
This question belongs to:
Maths
Time Speed and Distance
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