Area of a triangle 20m. length and 15m.breadth

A bus of length 10 m is overtaking another bus of the same length. If their speeds are 12m/s and 8m/s, how much time would be taken for overtaking ?

A vegetable-fruit merchant purchased 200 boxes of apples at the rate 5 boxes for Rs.40 and sold all the apples at the rate 4 boxes for Rs.50. Percentage of his profit is ?

The sum of the ages of a father and son is 52. The difference their ages is 28, then the age of the father is ?

If 2 raseto x = 8 raseto y then the possible values of x and y are :

There are 24 boys and 16 girls in a class. For a class test the average marks of boys is 25 and that of girls is 24. The average mark of the total students in that class is ?