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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
A spent 25% of his monthly income on study and 62% of the remaining on rent. If amount spent on rent is Rs. 930, then find the amount spent on study
A Sales Executive gets a commission on total sales at 8%. If the sale is exceeded Rs.10,000 he gets an additional commission as a bonus of 4% on the exc...
There were two candidate in an election. 15% of the total voters did not cast their votes whereas 10% of the casting votes were declared invalid. If th...
The monthly income of B is 25% more than that of A. If the income of B is Rs. 42000 and A saves 40% of his monthly income, then find A’s expenditure.
In an election contested between two candidates, 75% of the total voters in the city participated in voting, out of which 20% of ...
A man's annual income has increased by Rs 5 lakhs but the tax on income that he has to pay has reduced from 12% to 10%. He now pays Rs 10,000 more inco...
A quantity is increased by 60% at first, and later decreased by 45%. Calculate the net percentage change.
Rajesh spent 46% of his monthly income on food and 54% of the remaining of study. If total monthly savings (after spending on food and study) of Rajesh ...
In January 2023, Arti paid EMI which was 22 percent of her monthly salary. She paid the remaining amount on shopping on groceries and purchased clothes ...
