A missile travels at a speed of 1260 km/h. Find the distance covered by the missile in just 1 second. MCQ with Answer and Explanation
Question
Report Error
Discuss this Question (0)
Practice More Time Speed and Distance Questions
Question #1
Report Error
A motorboat covers 12 km upstream and returns back to the starting jetty in 3 hours. If the speed of the boat in still water is 9 km/h, find the speed of the river current.
Correct Answer: Option D
Explanation:
Let the speed of the current be c km/h. 12 / (9 - c) + 12 / (9 + c) = 3. Dividing by 3: 4 / (9 - c) + 4 / (9 + c) = 1 => 4(9 + c + 9 - c) = 81 - c^2 => 72 = 81 - c^2 => c^2 = 9 => c = 3 km/h.
Let the speed of the current be c km/h. 12 / (9 - c) + 12 / (9 + c) = 3. Dividing by 3: 4 / (9 - c) + 4 / (9 + c) = 1 => 4(9 + c + 9 - c) = 81 - c^2 => 72 = 81 - c^2 => c^2 = 9 => c = 3 km/h.
This question belongs to:
Maths
Time Speed and Distance
Question #2
Report Error
A marathon runner runs a distance of 42 km at a uniform speed of 12 km/h. What is the time taken to finish the race?
Correct Answer: Option D
Explanation:
Time = Distance / Speed = 42 / 12 = 3.5 hours = 3 hours 30 minutes.
Time = Distance / Speed = 42 / 12 = 3.5 hours = 3 hours 30 minutes.
This question belongs to:
Maths
Time Speed and Distance
Question #3
Report Error
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.
Correct Answer: Option C
Explanation:
Downstream tracking speed = 24 / 3 = 8 km/h. Upstream tracking speed = 24 / 6 = 4 km/h. Speed in still water = (8 + 4) / 2 = 12 / 2 = 6 km/h.
Downstream tracking speed = 24 / 3 = 8 km/h. Upstream tracking speed = 24 / 6 = 4 km/h. Speed in still water = (8 + 4) / 2 = 12 / 2 = 6 km/h.
This question belongs to:
Maths
Time Speed and Distance
No comments yet. Be the first to start the discussion!