Discussion
A 200m long train crosses a platform of certain length in 15 seconds. Speed of the train is 90 km/hr. Then the length of the platform is
Answer: D
The platform is 175m long.
To cross a platform, the train must cover its own length plus the platform's. Convert the speed to metres per second first:
\[ \begin{aligned} 90\ \text{km/h} &= 90 \times \frac{5}{18} = 25\ \text{m/s} \\ \text{distance} &= 25 \times 15 = 375\ \text{m} \\ \text{platform} &= 375 - 200 = 175\ \text{m} \end{aligned} \]
375 m is the total distance, which forgets to subtract the train's length; 225 m and 150 m do not follow from the data.
No comment is present. Be the first to comment.
Loading…
Post your comment
Please log in or register to post a comment.
Examination Categories
- SSC Exams
- Banking Exams
- Teaching Exams
- Civil Services Exams
- Railways Exams
- Engineering Recruitment Exams
- Defence Exams
- State Government Exams
- Police Exams
- Insurance Exams
- Nursing Exams
- Other Government Exams
- NRA CET
- PG Entrance Exams
- Campus Placement
- MBA Entrance Exams
- CUET and UG Entrance
- Judiciary Exams
- Regulatory Body Exams
- Software Development