A person can row 10 km/h in still water. If the speed of the river current is 3 km/h, find the time taken to row 28 km upstream. MCQ with Answer and Explanation
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Question #1
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A train passing a standing man takes 9 seconds, and it takes 21 seconds to pass a 240-meter long platform. Find the speed of the train in km/h.
Correct Answer: Option A
Explanation:
Time taken to cross the platform alone = 21 - 9 = 12 seconds. Speed of train = 240 / 12 = 20 m/s. In km/h = 20 * (18/5) = 72 km/h.
Time taken to cross the platform alone = 21 - 9 = 12 seconds. Speed of train = 240 / 12 = 20 m/s. In km/h = 20 * (18/5) = 72 km/h.
This question belongs to:
Maths
Time Speed and Distance
Question #2
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Walking at 5/6 of his usual speed, a man reaches his destination 15 minutes late. Find his usual time.
Correct Answer: Option B
Explanation:
New speed = 5/6 of usual speed => New time = 6/5 of usual time. Difference = 1/5 of usual time = 15 minutes. Usual time = 15 * 5 = 75 minutes.
New speed = 5/6 of usual speed => New time = 6/5 of usual time. Difference = 1/5 of usual time = 15 minutes. Usual time = 15 * 5 = 75 minutes.
This question belongs to:
Maths
Time Speed and Distance
Question #3
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A person walks from his house to his office at a speed of 4 km/h and reaches 10 minutes late. If he walks at 5 km/h, he reaches 5 minutes early. Find the distance between his house and office.
Correct Answer: Option D
Explanation:
Time difference = 10 - (-5) = 15 minutes = 1/4 hour. Let distance be d. d/4 - d/5 = 1/4 => d/20 = 1/4 => d = 5 km.
Time difference = 10 - (-5) = 15 minutes = 1/4 hour. Let distance be d. d/4 - d/5 = 1/4 => d/20 = 1/4 => d = 5 km.
This question belongs to:
Maths
Time Speed and Distance
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