A man rows a boat 20 km downstream in 2 hours and returns upstream in 5 hours. Find the speed of the stream. MCQ with Answer and Explanation
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Question #1
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A train covers a distance of 10 km in 12 minutes. If its speed is decreased by 5 km/h, what will be the time taken by it to cover the same distance?
Correct Answer: Option D
Explanation:
Original speed = 10 km / (12/60 hours) = 50 km/h. New speed = 50 - 5 = 45 km/h. New time = 10 / 45 hours = 2/9 hours = (2/9) * 60 minutes = 40/3 minutes = 13 minutes 20 seconds.
Original speed = 10 km / (12/60 hours) = 50 km/h. New speed = 50 - 5 = 45 km/h. New time = 10 / 45 hours = 2/9 hours = (2/9) * 60 minutes = 40/3 minutes = 13 minutes 20 seconds.
This question belongs to:
Maths
Time Speed and Distance
Question #2
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If a delivery agent cycles at 15 km/h instead of 11 km/h, he travels 20 km more in the same allotted duration. Find the actual distance covered by him at his lower speed.
Correct Answer: Option A
Explanation:
Let the time duration be t hours. Distance difference = 15t - 11t = 4t = 20 km => t = 5 hours. Distance covered at lower speed = 11 * 5 = 55 km.
Let the time duration be t hours. Distance difference = 15t - 11t = 4t = 20 km => t = 5 hours. Distance covered at lower speed = 11 * 5 = 55 km.
This question belongs to:
Maths
Time Speed and Distance
Question #3
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A sound wave maps along a valley channel at 330 m/s. How many seconds are required to span a distance length of 9.9 km?
Correct Answer: Option D
Explanation:
Distance = 9.9 km = 9900 meters. Time taken = 9900 / 330 = 30 seconds.
Distance = 9.9 km = 9900 meters. Time taken = 9900 / 330 = 30 seconds.
This question belongs to:
Maths
Time Speed and Distance
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