Question
Time is taken by two trains running in opposite
directions to cross a man standing on the platform in 31 seconds and 19 seconds respectively. It took 24 seconds for the trains to cross each other. What is the ratio of their speeds?Solution
Let the speed one train be x m/s and the speed of the second train be y m/s. Length of the first train = Speed × Time = 31x Length of second train = Speed × Time = 19y So, {(31x + 19y)/(x+y)} = 24 ⇒ 31x + 19y = 24x + 24y ⇒ 7x = 5y Therefore, x:y = 5:7
Present age of Karan is 75% more than the present age of Vivek. Ashish is 12 years younger to Karan. Present age of Vivek is 20% less than the present a...
The combined current ages of 'Pawan' and 'Bheem' add up to 36 years. 'Bheem's current age is half of what 'Ram's age will be 6 years from now. If 'Ram's...
Amit age after 20 years will be 4 times his age 4 years back. What is the present age of Amit?
After 12 years, "Aman" will be three times as old as he was 20 years ago. The age difference between "Aman" and "Bhanu" in twelve years will be 4:5, res...
The current age ratio of Rohit and Varun is 9:7. If 6 years back, the total of their ages was 120 years, what’s the gap between their present ages?
The present age of Ankit is the same as the age of Dev before 8 years, while the age of Dev after 4 years is 12 years more than the present age of Mohit...
- The average age of (x + 7) interns is 19 years. After adding a 41-year-old mentor, the average rises to 20 years. Find x% of 500.
The present age ratio of A and B is 4:7. After 5 years, the ratio of their ages will be 5:8. Find the present age of B.
Present age of ‘A’ is 40% more than that of ‘B’. If 11 years hence from now, ‘B’ will be 5 years younger than ‘A’, then find the sum of ...
‘A’ is 7 years younger than ‘B’ and 6 years elder than ‘C’. If the present age of ‘B’ and ‘D’ is 35 years and 24 years, respectively...
Relevant for Exams:
