If Rain covers 100 steps, at the rate of 25 steps per minute, 200 steps at 50 steps per 30 seconds and 200 steps at 1000 steps per half an hour and if his every step measures a meter how much time would he take to cover half a kilometer?

A person borrowed a loan of Rs. 2,000 and paid back in 4 instalments. Each instalment is more than the previous instalment by 50 Rs. then what is the amount of first instalment he paid ?

The sum of 7 times and 4 times of a given number is 66 then, what is the result if the second figure is subtracted (instead of adding) from the first ?

In a class, the average age of 40 students is 10. If teacher's age is added to student's | age, then the average becomes 11. What is the age of the teacher ?

The number 80 is divided into four so that if 3 is added to the first, 3 is subtracted from the second, the third is multiplied by 3 and the fourth is divided by 3 all give the same value. The lowest number is 5, what is the highest number?

A straight highway leads to the base of a 50 meter tall tower. From the top of the tower, if the angles of depression of two cars on the road are 30" and 60°, then the distance between the two cars is __________ m.