Let the speeds of boats ‘A’ and ‘B’ in still water be 8x km/hr and 9x km/hr Therefore, speed of the current = 0.25 × 8x = 2x km/hr According to the question, 8x + 2x = 750/7.5 Or, 10x = 100 Or, x = 10 Therefore, upstream speed of boat ‘B’ = 9x – 2x = 7x = 70 km/hr Downstream speed of boat ‘B’ = 9x + 2x = 11x = 110 km/hr Required time taken = (210/70) + (330/110) = 3 + 3 = 6 hours
Rakesh obtained 25% more marks than Ambuj and Suresh obtained 40% less marks than Rakesh. Marks obtained by Suresh are what percent less than marks o...
Out of total number of students in a class, 45% are boys and remaining are girls. If 50% of girls which is 176, participated in the drawing competition,...
12.5% of 32000 is how much more than 16.25% of 24000?
Anita has some money left after spending 20%, 10% and 30% of monthly salary on rent, electricity and shopping respectively. The remaining money with Ani...
If the student scores 25% marks then he is failed by 150 marks. But if he scores 55% marks then he is passed with 180 marks. Find the passing percentage?
A gave 40% of amount to B. B gave 30% of amount received from A to C. If amount received by C from B is Rs.144, then find the amount received by B from A.
P spends 22% of his salary on transportation, 30% on food, 15% on children’s education and 25% on medical. He deposits the remaining amount of Rs....
A gets 34% of the full marks in an exam and fails by 80 marks. B gets 36% of the full marks in the same exam and he also fails by 64 marks. What is the ...
A man spends 25% of his monthly salary on Rent and 32% on Groceries. He invest remaining monthly salary in the ratio of 11: 5 in Mutual Funds and Fixed ...
The population of a city is decreased by 14% in the first year and then increased by 25% in the second year. Find the population of the city at the end...
