Question
A boy goes to school with a speed of 65 km/h and comes
back with a speed of 35 km/h. find his average speed?Solution
Since the distance travelled by a boy (going to school and coming back from school) is equal. So, average speed = 2xy/(x + y) Average speed = (2 x 65 x 35)/(65 + 35) Average speed = (2 x 65 x 35)/100 = 45.5 km/hr
The respective ratio of the present ages of A and B is 7:6. The present age of C is 20% more than that of B. The sum of the present ages of A, B and C i...
Neha was married 5 years ago. In his present age 8/7 times of his age at the time of her marriage. Her son’s age is 1/8 times of her present age, ...
Rishav's current age is 25% more than Sourav's current age. In 8 years, the ratio of their ages will be 5:6. What will be Rishav's age 10 years from now?
The present age of P is 20% more than that of Q. P is 6.5 years older than R. Twelve years from now, S will be 9 years older than R. If the present aver...
In a family of four, the average age of Anu, Ben, Carla, and Dan is 28 years. The ratio of Carla's to Eva's present ages is 5:6, and Ben's age is 20% le...
At present, Naveen is six years younger than Mohit. Mohit’s age fifteen years hence will be equal to thrice that of Naveen three years ago. What w...
Amit age after 10 years will be 3 times his age 4 years back. What is the present age of Amit?
In a classroom there are 16 boys and 12 girls. Average age of each boy and each girl is 21 years and 17 years respectively. The sum of ages of all the b...
The sum of the present ages of a father and his daughter is 80 years. Eight years ago, the father’s age was seven times the age of his daughter. Eight...
When 6 years ago age of Vikas was divided by 18, the present age of his granddaughter Geeta is obtained. If Geeta is 2 years younger than her sister Sit...
Relevant for Exams:
