Question
If a person walks 25% more than of his usual speed,
reaches his distance 90 minutes before. If the destination is 247.5 km away, then the usual speed of a person is (in km/hr)?Solution
Let the usual speed be x km/hr New speed = 125% of x = 5x/4 km/hr Distance = 247.5 km According to the question 247.5/x – 247.5/(5x/4) = 90/60 247.5 x [(5 – 4)/5x] = 3/2 Therefore, x = 247.5 x (1/5) x (2/3) = 33 km/hr
The average marks of 'm' students in a math test is (m + 5) and the average marks of 30 girls is (2m - 10). If the average marks of all students togethe...
Average run scored by a batsman in first ‘x’ matches is 88. In next 10 matches he scored runs with an average of 100 so that his over...
Four numbers are arranged in ascending order. When the 1st two numbers are increased by the number equal to their position, and the last two numbers (i....
The average weight of a group of (x - 3) employees is (x + 4) kg. If a manager of weight 54 kg joins the office, then average weight of the group increa...
The average of n numbers is 65. If each of 54% of the numbers is increased by 15 and each of the remaining numbers is decreased by 10, then the new aver...
In an examination the average marks of Rohit is 62. If he got 19 more marks in science and 26 more marks in maths then his average would have been 67. F...
The average of 30 numbers is 55. The average of the first 15 numbers is 50 and the average of the last 12 numbers is 55. What is the average of 68, 74 a...
Average of four numbers is 24. Sum of smallest and largest number is 53. If difference between other two numbers is 1, then find the square of second sm...
Five friends each contributed Rs. 70. If the sixth friend gives Rs. 50 more than the average contribution of all six, how much did the sixth friend cont...
A company has 12 employees, including 8 engineers and 4 managers. The average salary of the engineers is E rupees, and the average salary of the manager...
Relevant for Exams:
