A bus travels at a certain speed for a distance of 75 km and then travels a distance of 90 km at a speed of 10 km/hr more than the first speed. If it takes 3 hours to complete the journey, find the original speed.

The speed of an ordinary train is x km per hour and that of an express train is (x + 25) km per hr.

(i) Find the time taken by each train to cover 300 km.

(ii) If the ordinary train takes 2 hrs more than the express train; calculate the speed of the express train.

The product of two whole numbers, each greater than 4, is 35; the numbers are :

1. -7 and -5

2. 7 and 5

3. 7 and -5

4. -7 and 5

The difference between digits of a two-digit number is 2 and the product of digits is 24. If tens digit is bigger, the number is :

1. 24

2. 26

3. 46

4. 64