A sound wave travels at 330 m/s. How long does it take to cover a distance of 6.6 km? MCQ with Answer and Explanation
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Question #1
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A commuter covers 40% of his total journey distance at 40 km/h and the remaining 60% at 60 km/h. Find his average speed for the whole journey.
Correct Answer: Option A
Explanation:
Let total distance be 100 km. Time for first part = 40 / 40 = 1 hour. Time for second part = 60 / 60 = 1 hour. Total distance = 100 km, Total time = 2 hours. Average speed = 100 / 2 = 50 km/h.
Let total distance be 100 km. Time for first part = 40 / 40 = 1 hour. Time for second part = 60 / 60 = 1 hour. Total distance = 100 km, Total time = 2 hours. Average speed = 100 / 2 = 50 km/h.
This question belongs to:
Maths
Time Speed and Distance
Question #2
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A motorboat registers a speed of 14 km/h in still water. If the river current tracks at 2 km/h, find the duration required to complete a 48 km downstream course.
Correct Answer: Option C
Explanation:
Downstream speed = 14 + 2 = 16 km/h. Time taken = Distance / Downstream speed = 48 / 16 = 3 hours.
Downstream speed = 14 + 2 = 16 km/h. Time taken = Distance / Downstream speed = 48 / 16 = 3 hours.
This question belongs to:
Maths
Time Speed and Distance
Question #3
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A scooter travels from town P to town Q at 30 km/h and returns at 45 km/h. Find the net average speed for the round journey.
Correct Answer: Option D
Explanation:
Average Speed = 2xy / (x + y) = (2 * 30 * 45) / (30 + 45) = 2700 / 75 = 36 km/h.
Average Speed = 2xy / (x + y) = (2 * 30 * 45) / (30 + 45) = 2700 / 75 = 36 km/h.
This question belongs to:
Maths
Time Speed and Distance
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