A man leaves point A at 6 AM at a speed of 4 km/h. Another man leaves point A from the same direction at 8 AM at a speed of 6 km/h. At what distance from point A will they meet? MCQ with Answer and Explanation
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Question #1
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A person rows 18 km downstream in 2 hours and covers the same distance upstream in 6 hours. What is the speed of the boat in still water?
Correct Answer: Option D
Explanation:
Downstream speed = 18 / 2 = 9 km/h. Upstream speed = 18 / 6 = 3 km/h. Speed in still water = (9 + 3) / 2 = 6 km/h.
Downstream speed = 18 / 2 = 9 km/h. Upstream speed = 18 / 6 = 3 km/h. Speed in still water = (9 + 3) / 2 = 6 km/h.
This question belongs to:
Maths
Time Speed and Distance
Question #2
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Two cars start from the same spot and travel along perpendicular roads. One travels at 15 km/h and the other at 20 km/h. Find the distance between them after 2 hours.
Correct Answer: Option C
Explanation:
In 2 hours, the first car travels 30 km and the second car travels 40 km. Direct distance = sqrt(30^2 + 40^2) = sqrt(900 + 1600) = sqrt(2500) = 50 km.
In 2 hours, the first car travels 30 km and the second car travels 40 km. Direct distance = sqrt(30^2 + 40^2) = sqrt(900 + 1600) = sqrt(2500) = 50 km.
This question belongs to:
Maths
Time Speed and Distance
Question #3
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A car covers a total distance of 180 km. It travels the first half of the distance at 30 km/h and the second half at 60 km/h. Find the average speed for the full journey.
Correct Answer: Option C
Explanation:
Average Speed = 2xy / (x + y) = (2 * 30 * 60) / (30 + 60) = 3600 / 90 = 40 km/h.
Average Speed = 2xy / (x + y) = (2 * 30 * 60) / (30 + 60) = 3600 / 90 = 40 km/h.
This question belongs to:
Maths
Time Speed and Distance
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