Question
Motor boat covers a certain distance downstream in 5
hours. It covers the same distance upstream in 7(1/2) hour. If the speed of the water is 4.5 km/hr, then the speed of the boat in still water is:Solution
Let the distance be ‘D’ km According to the question, Downstream speed x + y = d/5 or d = 5 (x+y) .......... (i) Upstream speed x-y = (d×2)/15 or d = (15(x-y))/2 ........... (ii) Comparing (i) & (ii) 5 (x+y) = (15(x-y))/2 10(x+y) = 15(x-y) 2(x+y) = 3(x-y) 2x + 2y = 3x - 3x x = 5y Hence, y = Speed of the current = 4.5 km/hour. Speed of boat, x = 5 × 4.5 = 22.5 km/hr
What was the theme for World Wide Web Day 2025 observed on August 1?
Which new legislative initiative is being introduced under the Jan Vishwas Bill 2.0 to improve the ease of doing business?
India’s foreign exchange reserves dropped to what value for the week ending October 18, 2024?
What do we call the banks which provide capital to the firms in the form of shares and engage in underwriting of stocks?
The government temporarily removed the 11% import duty on raw cotton till which date to provide relief to the textile sector?
What was the hydrogen fuel yield increase mechanism developed by JNCASR based on?
The first commercial coal mine of Arunachal Pradesh, Namchik-Namphuk, has an estimated reserve of how much?
Unique Identification Authority of India has put in place a resident friendly facility to help them update address in Aadhaar online with the consent o...
What is the main objective of the "Yuva Sahakar – Cooperative Enterprise Support and Innovation Scheme"?
Who commissioned the construction of the Qila-i-Kuhna Mosque?
Relevant for Exams:
