A boat moves upstream at 6 km/h and downstream at 12 km/h. Find the speed of the river current. MCQ with Answer and Explanation
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Question #1
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A car covers three successive 10 km stretches at speeds of 20 km/h, 30 km/h and 60 km/h respectively. Find its average speed.
Correct Answer: Option C
Explanation:
Total distance = 3 * 10 = 30 km. Total time taken = 10/20 + 10/30 + 10/60 = 1/2 + 1/3 + 1/6 = 1 hour. Average speed = 30 / 1 = 30 km/h.
Total distance = 3 * 10 = 30 km. Total time taken = 10/20 + 10/30 + 10/60 = 1/2 + 1/3 + 1/6 = 1 hour. Average speed = 30 / 1 = 30 km/h.
This question belongs to:
Maths
Time Speed and Distance
Question #2
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A track sprinter matches a 300-meter straight heat in 30 seconds. Find his moving speed in km/h.
Correct Answer: Option B
Explanation:
Speed in m/s = 300 / 30 = 10 m/s. In km/h = 10 * (18/5) = 36 km/h.
Speed in m/s = 300 / 30 = 10 m/s. In km/h = 10 * (18/5) = 36 km/h.
This question belongs to:
Maths
Time Speed and Distance
Question #3
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A car travels at a speed of 54 km/h. What is its speed expressed in meters per second?
Correct Answer: Option C
Explanation:
To convert km/h to m/s, multiply by 5/18. Speed = 54 * (5/18) = 3 * 5 = 15 m/s.
To convert km/h to m/s, multiply by 5/18. Speed = 54 * (5/18) = 3 * 5 = 15 m/s.
This question belongs to:
Maths
Time Speed and Distance
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