If Boat goes 80 km upstream in 4 hours and 60 km downstream in 2 hours, then the speed of the boat in still water is
Let the speed of boat = x and the speed of the stream = y 80/(x - y) = 4 => x - y = 20 60/(x + y) = 2 => x + y = 30 From above x = 25 km/hr
The ratio of present ages of Rohan to his father is 2:7, and the ratio of present ages of Rohan to his mother is 3:10. If Rohan's...
In 12 years, 'A's age will be three times what it was 20 years ago. After 12 years, the age ratio between 'A' and 'B' will be 4:5. Currently, the averag...
A man invested a sum of Rs. 25,000. He invested some part at 5% p.a. and remaining at 5.5% p.a.
How much money did he invest at 5% p.a.?
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Twelve years ago, the age ratio between 'A' and 'B' was 5:4. In five years, their average age is expected to be 44 years. Determine 'A’s age eight yea...
The present age of A is 9/5 times to that of his marriage age. Present age of his brother is 1/2nd of his present age. If A was married 24 years ago the...
The ratio of the present ages of a son and his father 3:7 and that of his mother and father is 6:7. Four years ago, the ratio of the age of the son that...
The ratio of Anil’s age to Anila’s age is 6 : 5 and the sum of their ages is 66 years. What will be the ratio of their ages after 14 years?
At the time of 'Binny's birth, the age of 'Ankush' was twice the present age of 'Binny'. Fourteen years from now, if the ratio of their ages is 25:13, f...
At present Meena is eight times her daughter’s age. Eight years from now, the ratio of the ages of Meena and her daughter will be 9 : 2 respective...
The average age of 66(2/3)% of the number of children in a group is 13 years. The average age of all the children in the group is 14.5 years. What is t...
