Start learning 50% faster. Sign in now
Let the speed of the stream be x km/h. Downstream speed: Speed of boat + speed of stream = 8 + x km/h Upstream speed: Speed of boat - speed of stream = 8 - x km/h Distance downstream: Since the man rows downstream for 1 hour, the distance downstream (d) is: d = Speed × Time = (8 + x) × 1 = 8 + x km Time taken upstream: Time = Distance / Speed = (8 + x) / (8 - x) hours According to the problem, the total time for the journey is 2.5 hours: Time downstream + Time upstream = 2.5 => 1 + (8 + x) / (8 - x) = 2.5 Subtracting 1 from both sides: (8 + x) / (8 - x) = 1.5 Now, cross-multiplying: 8 + x = 1.5(8 - x) 8 + x = 12 - 1.5x x + 1.5x = 12 - 8 2.5x = 4 x = 4 / 2.5 x = 1.6 km/h Correct Answer: a) 1.6 km/h.
What does the "Word Count" feature in a word processing software typically provide?
A person, 'Q', uses 40% of their monthly income on food and then spends 60% of what is left on rent. After covering these expense...
I). p 2 – 5p – 126 = 0
II). q 2 + 9q – 90 = 0
Income of A is twice the income of B. B and A spend 55% and 65% respectively of their incomes. Find the savings of A, if B saves Rs. 18000 in a month.
28, 52, 84, 124, 172, ?.
315 people went to a park. The number of men is 25 more than the number of women and the number of adults is 15 more than the number of children. How ma...
Pipe P can fill a tank by itself in 16 hours, while pipe R can empty the tank in 36 hours when it is full. Together, pipes P and ...
Ayush invested a certain amount at a compound interest rate of 20% per annum, compounded annually, for 2 years and earned Rs. 2,3...
Three colleagues, M, N, and O, have an average age of 27. Ten years ago, their ages were in the ratio of 4:6:7. What is the average age of M and N today?
A triangle has sides 7 cm, 24 cm, and 25 cm. A circle is inscribed in the triangle. What is the area of the triangle not covered by the circle?