A car maps a course distance of 240 km at an average speed of 60 km/h and handles the return trip at 40 km/h. Find the combined average speed. MCQ with Answer and Explanation
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Question #1
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The speed of a boat downstream is 18 km/h and upstream is 12 km/h. How much distance can the boat cover in still water in 3 hours?
Correct Answer: Option A
Explanation:
Speed of the boat in still water = (Downstream Speed + Upstream Speed) / 2 = (18 + 12) / 2 = 15 km/h. Distance covered in 3 hours = 15 * 3 = 45 km.
Speed of the boat in still water = (Downstream Speed + Upstream Speed) / 2 = (18 + 12) / 2 = 15 km/h. Distance covered in 3 hours = 15 * 3 = 45 km.
This question belongs to:
Maths
Time Speed and Distance
Question #2
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A car covers a distance of 240 km in 3 hours 20 minutes. Find its average speed.
Correct Answer: Option A
Explanation:
Time = 3 hours 20 minutes = 3 + 20/60 = 3.333 hours = 10/3 hours. Speed = Distance / Time = 240 / (10/3) = 240 * 3 / 10 = 72 km/h.
Time = 3 hours 20 minutes = 3 + 20/60 = 3.333 hours = 10/3 hours. Speed = Distance / Time = 240 / (10/3) = 240 * 3 / 10 = 72 km/h.
This question belongs to:
Maths
Time Speed and Distance
Question #3
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A person covers a distance of 80 km at 20 km/h and another 120 km at 40 km/h. Find his average speed for the whole journey.
Correct Answer: Option A
Explanation:
Total distance = 80 + 120 = 200 km. Total time taken = 80/20 + 120/40 = 4 + 3 = 7 hours. Average speed = 200 / 7 = 28.57 km/h.
Total distance = 80 + 120 = 200 km. Total time taken = 80/20 + 120/40 = 4 + 3 = 7 hours. Average speed = 200 / 7 = 28.57 km/h.
This question belongs to:
Maths
Time Speed and Distance
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