A car travels a distance of 420 km at a certain speed. If the speed is increased by 15 km/h, it takes 5 hours for the journey. Find the original speed. MCQ with Answer and Explanation
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Question #1
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A man rows downstream 28 km in 2 hours and upstream 12 km in 2 hours. Find the speed of the current.
Correct Answer: Option C
Explanation:
Downstream speed = 28 / 2 = 14 km/h. Upstream speed = 12 / 2 = 6 km/h. Speed of current = (14 - 6) / 2 = 8 / 2 = 4 km/h.
Downstream speed = 28 / 2 = 14 km/h. Upstream speed = 12 / 2 = 6 km/h. Speed of current = (14 - 6) / 2 = 8 / 2 = 4 km/h.
This question belongs to:
Maths
Time Speed and Distance
Question #2
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A car climbs a mountain path 12 km long at 4 km/h and descends the same distance at 12 km/h. Find the average speed for the round journey.
Correct Answer: Option A
Explanation:
Average Speed = 2xy / (x + y) = (2 * 4 * 12) / (4 + 12) = 96 / 16 = 6 km/h.
Average Speed = 2xy / (x + y) = (2 * 4 * 12) / (4 + 12) = 96 / 16 = 6 km/h.
This question belongs to:
Maths
Time Speed and Distance
Question #3
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A wheel of diameter 70 cm makes 400 revolutions per minute. Find the speed of the vehicle in km/h.
Correct Answer: Option D
Explanation:
Radius r = 35 cm = 0.35 meters. Circumference = 2 * (22/7) * 0.35 = 2.2 meters. Distance covered in 1 minute = 400 * 2.2 = 880 meters. Distance covered in 1 hour = 880 * 60 = 52800 meters = 52.8 km. Speed = 52.8 km/h.
Radius r = 35 cm = 0.35 meters. Circumference = 2 * (22/7) * 0.35 = 2.2 meters. Distance covered in 1 minute = 400 * 2.2 = 880 meters. Distance covered in 1 hour = 880 * 60 = 52800 meters = 52.8 km. Speed = 52.8 km/h.
This question belongs to:
Maths
Time Speed and Distance
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