A man covers 2/3 of a journey at 40 km/h, 1/4 of the journey at 30 km/h and the remainder at 10 km/h. What is his average speed for the entire journey? MCQ with Answer and Explanation
Question
Report Error
Discuss this Question (0)
Practice More Time Speed and Distance Questions
Question #1
Report Error
A train 150 meters long is traveling at a speed of 45 km/h. How much time will it take to clear a platform 300 meters long?
Correct Answer: Option D
Explanation:
Total distance = 150 + 300 = 450 meters. Speed = 45 * (5/18) = 12.5 m/s. Time taken = 450 / 12.5 = 36 seconds.
Total distance = 150 + 300 = 450 meters. Speed = 45 * (5/18) = 12.5 m/s. Time taken = 450 / 12.5 = 36 seconds.
This question belongs to:
Maths
Time Speed and Distance
Question #2
Report Error
A person rows 18 km downstream in 2 hours and covers the same distance upstream in 6 hours. What is the speed of the boat in still water?
Correct Answer: Option B
Explanation:
Downstream speed = 18 / 2 = 9 km/h. Upstream speed = 18 / 6 = 3 km/h. Speed in still water = (9 + 3) / 2 = 6 km/h.
Downstream speed = 18 / 2 = 9 km/h. Upstream speed = 18 / 6 = 3 km/h. Speed in still water = (9 + 3) / 2 = 6 km/h.
This question belongs to:
Maths
Time Speed and Distance
Question #3
Report Error
A train passes a standing track worker in 12 seconds and crosses a platform 200 meters long in 22 seconds. Find the length of the train.
Correct Answer: Option D
Explanation:
Time taken to cross platform alone = 22 - 12 = 10 seconds. Speed of train = 200 / 10 = 20 m/s. Length of train = Speed * Time to cross worker = 20 * 12 = 240 meters.
Time taken to cross platform alone = 22 - 12 = 10 seconds. Speed of train = 200 / 10 = 20 m/s. Length of train = Speed * Time to cross worker = 20 * 12 = 240 meters.
This question belongs to:
Maths
Time Speed and Distance
No comments yet. Be the first to start the discussion!