A stream flows at 3 km/h. A boat can row 9 km/h in still water. How much time does it take to go 24 km downstream and return upstream to the starting point? MCQ with Answer and Explanation
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Question #1
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The speeds of two bodies are in the ratio 5 : 6. If they clear the same sector distance, and the slower car takes 3 hours, how much time does the faster car take?
Correct Answer: Option A
Explanation:
Ratio of speeds = 5:6, so ratio of times taken = 6:5. Slower car takes 6 parts = 3 hours => 1 part = 0.5 hours. Time for faster car = 5 parts = 5 * 0.5 = 2.5 hours.
Ratio of speeds = 5:6, so ratio of times taken = 6:5. Slower car takes 6 parts = 3 hours => 1 part = 0.5 hours. Time for faster car = 5 parts = 5 * 0.5 = 2.5 hours.
This question belongs to:
Maths
Time Speed and Distance
Question #2
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A boat can row 12 km/h in still water. If the current marks 3 km/h, find the distance covered downstream by the boat in exactly 40 minutes.
Correct Answer: Option A
Explanation:
Downstream speed = 12 + 3 = 15 km/h. Time = 40 minutes = 40/60 = 2/3 hours. Distance = Speed * Time = 15 * (2/3) = 10 km.
Downstream speed = 12 + 3 = 15 km/h. Time = 40 minutes = 40/60 = 2/3 hours. Distance = Speed * Time = 15 * (2/3) = 10 km.
This question belongs to:
Maths
Time Speed and Distance
Question #3
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Walking at 3/4 of his normal pace, a student is 12 minutes late. Find his usual time.
Correct Answer: Option B
Explanation:
New speed = 3/4 of usual speed => New time = 4/3 of usual time. Difference = 1/3 of usual time = 12 minutes. Usual time = 12 * 3 = 36 minutes.
New speed = 3/4 of usual speed => New time = 4/3 of usual time. Difference = 1/3 of usual time = 12 minutes. Usual time = 12 * 3 = 36 minutes.
This question belongs to:
Maths
Time Speed and Distance
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