Discussion
The downstream speed of a boat is 18 km/hr and its upstream speed is 12 km/hr. What is the speed of the stream ?
Answer: B
Correct answer: 3 km/hr
Downstream speed is \(b+s\) and upstream is \(b-s\), so their difference is twice the stream speed:
\[s = \frac{18 - 12}{2} = 3 \text{ km/hr}\]
Their sum gives the boat’s own speed, \(\tfrac{18+12}{2} = 15\) km/hr.
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