Question
A boat can cover 70 km in still water and 72 km in
downstream in 4 hours and 3 hours respectively. Find the time taken by the boat to cover 66 km upstream and 48 km downstream.Solution
Speed of the boat in still water = 70/4 = 17.5 km/h Downstream speed of the boat = 72/3 = 24 km/h Speed of the stream = 24 – 17.5 = 6.5 km/h Upstream speed of the boat = 17.5 – 6.5 = 11 km/h Time taken to cover 66 km upstream and 48 km downstream = 66/11 + 48/24 = 6 + 2 = 8 hours
Currently, Person 'A' is 42 years old. Person 'B' is 6 years younger than 'A'. Three years ago, the age of 'C' was 25% less than what 'B' is right now. ...
Amit age after 13 years will be 3 times his age 5 years back. What is the present age of Amit?
A girl’s age is 160% of what it was 5 years ago, but 80% of what it will be after 6 years. What is her present age?
- The ratio of the present ages of P to Q is 4:3 respectively. If the age of P two years ago is same as the age of Q three years hence, then find the present...
The ratio of the present ages of P and Q is 6:5 respectively. If the age of P 12 years hence from now will be 125% more than the age of Q 4 years ago fr...
- The ratio of present ages of Aman to that of Dinesh is 2:3 while the ratio of present ages of Rohan to that of Dinesh is 5:3. If the age of Rohan, 4 years ...
Present age of ‘A’ is 40% more than that of ‘B’. If 10 years hence from now, ‘B’ will be 4 years younger than ‘A’, then find the sum of ...
Ratio of present ages of A and B is 7:5, respectively. C who is 3 years older than A will become 36 years older after 12 years. Find the present age of B.
At the time of their marriage, the ages of Karan and Divya were in the ratio 13:12. Two years before their marriage, Karan’s age was 10% more than Div...
Ratio of present ages of P and Q is 2:5. After two years from now the ratio of ages of P and R will be 5:12. R is one year elder to Q. Find the present ...
Relevant for Exams:
