How much time does a train 125 metres long running at 60 km/hr take to pass a pole?
Correct answer: C. 7.5s
- A. 6s
- B. 2.08s
- C. 7.5s
- D. 8s
Explanation
Convert 60 km/h to metres per second: 60 x 1000/3600 = 16.67 m/s. Passing a pole requires covering the train's length, so time = 125 m / 16.67 m/s = 7.5 s. The common wrong choice is 2.08 s, which results from using 60 directly with metres without converting the speed.
Last updated
About Time, Speed and Distance
Problems relate distance, speed and time through the formula distance = speed × time, including unit conversion, average speed, relative speed and motion in opposite or the same direction. Questions may involve trains, boats and streams, where the effective speed changes, so average speed must not be confused with the simple average of two speeds.
Practise Arithmetic
1,060 free Arithmetic MCQs from Mathematics, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask Mathematics questions like this
Mathematics is on 67 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
Related questions
A and B go cycling in the same direction with speeds of 6 km/hr and 12 km/hr. A car from behind passes them in 9 and 10 seconds respectively. What is the speed of the car?
A and B walk around a circular track. A and B walk at a speed of 2 rounds per hour and 3 rounds per hour respectively. If they start at 8 a.m. from the same point in opposite directions, how many times shall they cross each other before 9.30 a.m.?
A boat can move upstream at 25 kmph and downstream at 35 kmph, then the speed of the current is_________?
A boat covers a distance of 30 km in 2 ½ hours running downstream while returning it covers the same distance in 3 ¾ hours. What is the speed of the boat in still water?
A boat goes 24 km downstream in 10 hours, it takes 2 hours more to cover the same distance against the stream. What is the speed of the boat in still water?