Question
Time is taken by two trains running in opposite
directions to cross a man standing on the platform in 27 seconds and 17 seconds respectively. It took 21 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 = 27x Length of second train = Speed × Time = 17y So, {(27x + 17y)/(x+y)} = 21 ⇒ 27x + 17y = 21x + 21y ⇒ 6x = 4y Therefore, x:y = 2:3
x men can finish a work in y days. 0.9x women can finish 1/3rd of the same work in (y - 8) days. If 0.8x women can complete 1/3rd work in 36 days. Find ...
Team A can built a project in 4 hours less than the time taken by Team B to built the same project.
The ratio of the strength of Team A to that o...
A, B and C can mow a field in 36 days, 72 days and 54 days respectively. All the three began the work together on January 1, 2016, but A left 8 days and...
‘F’ is 66.67% more efficient than ‘G’. ‘G’ worked alone for 10 days, and then ‘F’ completed the rest of the work. If the entire job was ...
- A woman is one-third as efficient as a man. How much time will 9 women take to complete a job that is 75% of the work done by 10 men in 12 days?
A boy(labour) was appointed by a manager on the term that he would be paid Rs 55 for each day of his work but would be fined at the rate of Rs 5 per day...
Anil alone can finish some work in 50 days. Anil and Aman completed the work together and earned Rs. 9,000 as wage. If Aman's wage share is Rs. 3,600, t...
Rahul can complete a work in 12 days and Ayush in 15 days. If they work together for 3 days, then the fraction of work that will be left is:
‘M’ and ‘N’ together can do a work in 20 days. If ‘M’ increases his efficiency by 25% while ‘N’ decreases his efficiency by 50%, then t...
Karan is five times as efficient as Varun and twice as efficient as Arjun. If Varun takes 30 days to finish some work, then find the time taken by Karan...
Relevant for Exams:
