Train ‘A’ running with a speed of 18 km/h crosses a pole in 8 seconds. If the time taken by train ‘A’ to cross train ‘B’ running with a speed of 54 km/h and coming from the opposite direction is 10 seconds, then find the length of train B.
Speed of train A = 18 × 5/18 = 5 m/s Length of train A = 5 × 8 = 40 metres Let length of train B = ‘l’ metres Speed of train B = 54 × 5/18 = 15 m/s Relative speed if train A with respect to train B = 15 + 5 = 20 m/s So, I + 40 = 20 × 10 = 200 So, l = 160 metres
The average age of a class was 16 years. 8 new students with an average age of 12 years joined the class. So, the average age of class decreased...
A bowler gives 16.2 runs per wicket. He gives 40 runs and takes 4 wickets in a last match after which his average becomes 15.4 runs per wicket. How many...
The average of 75 percent of x and 48 percent of y is 90. What will be the average of 125 percent of x and 80 percent of y?
In a factory, the average salary of all employees is Rs. 5600 and the average salary of 24 supervisor is 7200. If the average salary of labours is 4800,...
The average temperature of Monday, Tuesday, Wednesday and Thursday is 50°. The average temperature for Tuesday, Wednesday, Thursday and Friday is 60°....
In a school with 400 students, the average of the age of the boys is 16 years and that of the girls is 12 years. If the average age of the school is 14 ...
The average of the first and second numbers is 20, while the average of the second and third numbers is 25. If the sum of the first and third numbers is...
There are three categories of jobs HR, CA and PA. The average salary of the student who got the job of HR and CA category is 20 lakhs per annum. The ave...
Average age of a class of 28 students is 10 years. Average age of the class is increased by 12 months if the age of the teacher is included. Find...
Average age of company A is 25 years and average age of both companies A and B is 17 years. If the ratio of number of employees in company A and B is 3:...