Question
Three runners A, B and C run a race, with runner A
finishing 12 meters ahead of runner B and 18 meters ahead of runner C, in another race of same type runner B finished 8 meters ahead of runner C. Each runner travels the entire distance at a constant speed. the length of the race is.Solution
Let A finish the race of = x m B finish the race of =x-12 C finish the race of =x-18       … (1) In another race of B and C B finish race of =x C finish race of =x-8   … (2) Ratio of speeds of B and C (x-12)/(x-18) =x/x-8 (x-12) ×(x-8) =x(x-8) 2x=96 X=48meter.
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...
The average salary of all males and females in an office is Rs.16000 and the total number of females in the office is 16. If the average salaries of mal...
The average age of a group of persons going for tour to Shimla is 22 years. 30 new persons with an average age of 8 years join the group and their avera...
Fifteen movie theatres average 600 customers per theatre per day. If six of the theatres close down but the total theatre attendance stays the same, the...
The average cost of three chairs is Rs.10000. The average cost decrease by 12% when one more chair is included. What is the cost price of the 4th
The average height of each student in a class of 20 students is 125 cm. If 10 new students joined the class, then the average height of the each student...
The average mark obtained by 140 candidates in a certain examination is 40. If the average marks of passed candidates are 55 and that of the failed cand...
The average weight of 4 persons is 35 kg. The heaviest person’s weight is 24 kg more than the lightest person’s weight. If the average weight of the...
The meaning of 12 observations is 15. One more observation is included, and the new mean becomes 17. The 13th observation is.
What will be the average of odd numbers between 20 to 74?
Relevant for Exams:
