Question
A police man goes after a thief who has 100m start. If
the policeman runs a KM in 8 min and the thief runs a km in 10 min, how far will the thief have gone before he is overtaken?Solution
Speed of policeman = 1km/8min = 1km/(8/60) = 7.5 kmph Speed of thief = 1km/ (10min) = 1km/(10/60) = 6kmph So time = Distance /speed = 100m /(7.5-6)kmph = 0.1km/ 1.5kmph = 1/15 hrs = 4min Distance travelled by theif in 4min = 6kmph x 4min = 6 x 5/18 x 4 x 60 m = 400m & he has also start of 100m, so total distance travelled by thief till he overtook by policeman= 100m+400m = 500m
The average cost of three chairs is Rs.12000. The average cost decrease by 18% when one more chair is included. What is the cost price of the 4th
If average of first 9 numbers is (n – 50) and the sum of remaining number is 1620. Find the value of ‘n’, if the average of 21 numbers is ‘n’....
A bag contains 20 rupees note, 50 rupees note and 100 rupees note in the ratio 5:7:2. If the total amount in the bag is Rs 2,600, find the average numbe...
- In a warehouse, the ratio of the number of boxes containing books, clothes, and electronics is 7:5:3, respectively, and the average number of boxes of each...
The average age of a group of 10 students is 30 years. Two persons of age 40 years and 35 years, left the group and 2 persons of age 50 years and 95 yea...
5 positive numbers are written on a piece of paper. Sum of first 3 numbers is 60 and ratio of the 4th and the 5th number is 2:3. If difference between t...
- Rs. 4200 was distributed among 'P', 'Q', 'R' and 'S' in the ratio 2:5:4:3 respectively. Later, 'Q' gave an amount equal to 80% of the average amount receiv...
A mixture contains oil and water in the ratio 7:5. When 70% of this mixture is replaced with 153 litres of water, the ratio becomes 8: 13. Than, what wi...
Each question contains a statement followed by Quantity I and II. Read the information clearly and answer your questions accordingly.Â
 Quan...
- The number of students in class 'A' is 100, and the ratio of the number of girls to boys is 2:3. If the average number of boys in classes A and B is 105, a...
Relevant for Exams:
