A truck covers 300 meters in 20 seconds. Find its speed in km/h. MCQ with Answer and Explanation
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Question #1
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A boatman rows 20 km downstream in 2 hours and covers the same distance upstream in 4 hours. Find the speed of the boat in still water.
Correct Answer: Option D
Explanation:
Downstream speed = 20 / 2 = 10 km/h. Upstream speed = 20 / 4 = 5 km/h. Speed in still water = (10 + 5) / 2 = 7.5 km/h.
Downstream speed = 20 / 2 = 10 km/h. Upstream speed = 20 / 4 = 5 km/h. Speed in still water = (10 + 5) / 2 = 7.5 km/h.
This question belongs to:
Maths
Time Speed and Distance
Question #2
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A bus moving at 42 km/h covers a distance in 8 hours. At what speed must it travel to cover the same distance in 6 hours?
Correct Answer: Option B
Explanation:
Distance = 42 * 8 = 336 km. Required speed = 336 / 6 = 56 km/h.
Distance = 42 * 8 = 336 km. Required speed = 336 / 6 = 56 km/h.
This question belongs to:
Maths
Time Speed and Distance
Question #3
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Two points P and Q are 210 km apart. Train A leaves P for Q at 50 km/h at 10:00 AM. Train B leaves Q for P at 70 km/h at 11:00 AM. At what time will they pass each other?
Correct Answer: Option B
Explanation:
By 11:00 AM, Train A covers 50 km * 1 hour = 50 km. Remaining distance = 210 - 50 = 160 km. Relative speed = 50 + 70 = 120 km/h. Time to meet after 11:00 AM = 160 / 120 = 4/3 hours = 1 hour 20 minutes. Meeting time = 11:00 AM + 1 hour 20 minutes = 12:20 PM.
By 11:00 AM, Train A covers 50 km * 1 hour = 50 km. Remaining distance = 210 - 50 = 160 km. Relative speed = 50 + 70 = 120 km/h. Time to meet after 11:00 AM = 160 / 120 = 4/3 hours = 1 hour 20 minutes. Meeting time = 11:00 AM + 1 hour 20 minutes = 12:20 PM.
This question belongs to:
Maths
Time Speed and Distance
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