Question
Download Solution PDFA boat goes 330 km upstream in 55 hours and a distance of 520 km downstream in 65 hours. Find the speed of the boat in still water. (In kmph)
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFGiven:
Distance upstream = 330 km
Time upstream = 55 hours
Distance downstream = 520 km
Time downstream = 65 hours
Formula used:
Speed of boat in still water = \(\frac{\text{Speed downstream} + \text{Speed upstream}}{2}\)
Speed downstream = \(\frac{\text{Distance downstream}}{\text{Time downstream}}\)
Speed upstream = \(\frac{\text{Distance upstream}}{\text{Time upstream}}\)
Calculation:
Speed downstream = \(\frac{520}{65}\) = 8 kmph
Speed upstream = \(\frac{330}{55}\) = 6 kmph
Speed of boat in still water = \(\frac{8 + 6}{2}\) = 7 kmph
∴ The correct answer is option 4.
Last updated on Jul 4, 2025
-> The UP Police Sub Inspector 2025 Notification will be released by the end of July 2025 for 4543 vacancies.
-> A total of 35 Lakh applications are expected this year for the UP Police vacancies..
-> The recruitment is also ongoing for 268 vacancies of Sub Inspector (Confidential) under the 2023-24 cycle.
-> The pay Scale for the post ranges from Pay Band 9300 - 34800.
-> Graduates between 21 to 28 years of age are eligible for this post. The selection process includes a written exam, document verification & Physical Standards Test, and computer typing test & stenography test.
-> Assam Police Constable Admit Card 2025 has been released.