A truck covers three successive 8 km stretches at uniform speed metrics of 12 km/h, 24 km/h and 24 km/h. Find its net average speed. MCQ with Answer and Explanation
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Question #1
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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.
Correct Answer: Option D
Explanation:
Average Speed = 2xy / (x + y) = (2 * 60 * 40) / (60 + 40) = 4800 / 100 = 48 km/h.
Average Speed = 2xy / (x + y) = (2 * 60 * 40) / (60 + 40) = 4800 / 100 = 48 km/h.
This question belongs to:
Maths
Time Speed and Distance
Question #2
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A man rows a boat 20 km downstream in 2 hours and returns upstream in 5 hours. Find the speed of the stream.
Correct Answer: Option C
Explanation:
Downstream speed = 20 / 2 = 10 km/h. Upstream speed = 20 / 5 = 4 km/h. Speed of stream = (10 - 4) / 2 = 6 / 2 = 3 km/h.
Downstream speed = 20 / 2 = 10 km/h. Upstream speed = 20 / 5 = 4 km/h. Speed of stream = (10 - 4) / 2 = 6 / 2 = 3 km/h.
This question belongs to:
Maths
Time Speed and Distance
Question #3
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A mechanical wheel has a radius of 7 cm. How many revolutions are required to cover a linear distance of 44 meters?
Correct Answer: Option A
Explanation:
Circumference of the wheel = 2 * (22/7) * 7 = 44 cm = 0.44 meters. Total distance = 44 meters. Number of revolutions = 44 / 0.44 = 100.
Circumference of the wheel = 2 * (22/7) * 7 = 44 cm = 0.44 meters. Total distance = 44 meters. Number of revolutions = 44 / 0.44 = 100.
This question belongs to:
Maths
Time Speed and Distance
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