A man rows a distance of 16 km downstream in 2 hours and returns upstream in 4 hours. Find the speed of the river current. MCQ with Answer and Explanation
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Question #1
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A luxury car handles a tracking route sector of 240 km. It finishes the first half segment stretch at 40 km/h and the second half sector at 60 km/h. Find the mean average speed recorded across the full route.
Correct Answer: Option A
Explanation:
Average Speed across sectors = 2xy / (x + y) = (2 * 40 * 60) / (40 + 60) = 4800 / 100 = 48 km/h.
Average Speed across sectors = 2xy / (x + y) = (2 * 40 * 60) / (40 + 60) = 4800 / 100 = 48 km/h.
This question belongs to:
Maths
Time Speed and Distance
Question #2
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Walking at 3/5 of his normal speed, a person is 20 minutes late to his destination. What is his normal time?
Correct Answer: Option B
Explanation:
New speed = 3/5 of normal speed => New time = 5/3 of normal time. Difference = 2/3 of normal time = 20 minutes. Normal time = (20 * 3) / 2 = 30 minutes.
New speed = 3/5 of normal speed => New time = 5/3 of normal time. Difference = 2/3 of normal time = 20 minutes. Normal time = (20 * 3) / 2 = 30 minutes.
This question belongs to:
Maths
Time Speed and Distance
Question #3
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A runner tracks a circular field of radius 140 meters. If his speed is 5 m/s, how long does he take to complete a single lap?
Correct Answer: Option A
Explanation:
Circumference = 2 * (22/7) * 140 = 880 meters. Time taken = Distance / Speed = 880 / 5 = 176 seconds.
Circumference = 2 * (22/7) * 140 = 880 meters. Time taken = Distance / Speed = 880 / 5 = 176 seconds.
This question belongs to:
Maths
Time Speed and Distance
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