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Let the speed of the boat in still water and the speed of the current be ‘x’ km/hr and ‘y’ km/hr, respectively Upstream speed of the boat = (x – y) = 240/12 = 20 km/hr Or, 30 – y = 20 Or, y = 30 – 20 = 10 km/hr Therefore, downstream speed of the boat = 30 + 10 = 40 km/hr Required time taken = 140/40 = 3.5 hours
The ratio of the number of cats to sheep on a farm is 5:8. The total number of cats and sheep is 91. The combined weight of all t...
The average marks scored by 32 boys and 38 girls are 70 and 92 respectively. Find the average marks scored by all the students together. (Answer should ...
Piyush bought 18 notebooks for Rs.1220 from shop A and 14 notebooks for Rs.860 from shop B. What is the average price he paid per book?
The average of 18 numbers is 36. If 4 is added to each number, then the new average will be:
The average age of three children is 15 years. If their ages are in the ratio 2:3:4. Find the age of the youngest child.
The average weight of 4 persons is 30 kg. The heaviest person’s weight is 24 kg more than the lightest person’s weight. If the average weight of the...
There are 15 numbers such that average of first 12 numbers is 65 while the average of last five numbers is 76. Find the 12th number, if the ratio betwee...
Determine the average marks achieved by six additional aspirants if the average score of 24 aspirants in a mock test is 67. Adding the marks of these si...
In a classroom, there are 24 male students and 16 female students. The male students have an average age of 16 years, while the female students average ...
