A boat crew row a boat 24 km downstream in 3 hours and tracks the identical loop back upstream in 6 hours. Find the baseline speed of the boat in still water. MCQ with Answer and Explanation
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Question #1
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A bicycle wheel has a radius of 28 cm. How many revolutions are mandatory to span a total course line of 880 meters?
Correct Answer: Option B
Explanation:
Circumference = 2 * (22/7) * 28 = 176 cm = 1.76 meters. Total course line = 880 meters. Number of revolutions = 880 / 1.76 = 500.
Circumference = 2 * (22/7) * 28 = 176 cm = 1.76 meters. Total course line = 880 meters. Number of revolutions = 880 / 1.76 = 500.
This question belongs to:
Maths
Time Speed and Distance
Question #2
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A man can row 8 km/h in still water. If the river current flows at 2 km/h, it takes him 3.2 hours to row to a place and back. How far is the place?
Correct Answer: Option C
Explanation:
Downstream speed = 8 + 2 = 10 km/h. Upstream speed = 8 - 2 = 6 km/h. Let distance be d. d / 10 + d / 6 = 3.2 => 16d / 60 = 3.2 => 16d = 192 => d = 12 km.
Downstream speed = 8 + 2 = 10 km/h. Upstream speed = 8 - 2 = 6 km/h. Let distance be d. d / 10 + d / 6 = 3.2 => 16d / 60 = 3.2 => 16d = 192 => d = 12 km.
This question belongs to:
Maths
Time Speed and Distance
Question #3
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A car covers a distance of 200 km at a uniform speed. If the speed is increased by 10 km/h, the journey takes 4 hours. Find the initial speed of the car.
Correct Answer: Option B
Explanation:
New speed = 200 / 4 = 50 km/h. Since the new speed is 10 km/h faster than the original speed, original speed = 50 - 10 = 40 km/h.
New speed = 200 / 4 = 50 km/h. Since the new speed is 10 km/h faster than the original speed, original speed = 50 - 10 = 40 km/h.
This question belongs to:
Maths
Time Speed and Distance
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