Question
A boat running downstream covers a distance of 45 km in
9 hrs and covering the same distance upstream in 15 hrs. What is the speed of a boat in still water?Solution
Downstream speed = 45/9 = 5 km/hr Upstream speed = 45/15 = 3 km/hr So speed of boat in still water = (5 + 3)/2 = 4 km/hr
The ratio between two numbers is 4:5. If each number is increased by 6, the ratio between then become 7:8, find the difference between numbers.
What is the ratio whose terms differ by 40 and the measure of which is 3/5?
P and Q together have Rs 2,420. If 8/15 of P’s amount is equal to 4/5 of Q’s amount, how much amount does Q have?
In 2023, ratio of boys and girls in a school was 2:3, respectively. In 2024, 20 boys join and 30 girls leave the school, so the ratio of boys to girls ...
In an orchard, the ratio of the number of mango and lichi trees is 2:5, respectively. Also, there are few apple trees in the orchard which is 50% more t...
In 2023, ratio of boys and girls in a school was 5:7, respectively. In 2024, 25 boys join and 35 girls leave the school, so the ratio becomes 1:1. Find ...
A:B = 4:7 and B:C = 3:5. Find A:C.
Ratio of number of book to number of pen sold by a shopkeeper is 25:18, respectively while ratio of number of pen to number of pencil sold by the same s...
In a factory, the ratio of number of male to female employees are 7: 18. If 27 male employees and 12 female employees left the factory, then the ratio b...
The ratio of the incomes of Vineet and Vidya is 12:5 respectively. Vineet saves 25% of his income while Vidya saves 20% of his income. The sum of their...
