Manoj takes 30 seconds to cover a distance of 270 m on increasing his speed by 60%. If he travels at his original speed, how much time will he take to cover the same distance?

A hall is 15 m long and 12 m broad. If the sum of the areas of the floor and the ceiling is equal to the sum of the areas of four walls, then the volume of the hall is

A can do a piece of work in 80 days. He works on it for 10 days and then, B alone finishes the remaining work in 49 days. In how much time will A and B, working together, finish the work?

While finding the average of 9 consecutive numbers starting from X, a student interchanged the digits of the second number by mistake and got the average 8 more than the actual average. Find the value of X.

A, B and C complete a piece of work for Rs. 2000. A works for 8 days, B for 9 days and C for 12 days to complete the work. If their daily wages are in the ratio 4 : 5 : 4, what is the share of A?

Three partners: A, B and C invested capital in the ratio 5 : 3 : 2 for time periods in the ratio 3 : 4 : 6. Find the ratio of their profits.

The difference between 90% and 85% of a number is 225. What is 90% of that number?

A motorist travels a distance of 20 km at a speed of 55 km/h and travels at the speed of 65 km/h while returning. What is his average speed?

The ratio among the angles of a quadrilateral is 6 : 4 : 5 : 3. If the greatest angle of a triangle is 30 less than 5/6^th of the greatest angle of the quadrilateral and if another angle of triangle is 3/5^th of the second largest angle of the quadrilateral, then find the third angle of the triangle.

A group of 50 men took a dip in a water tank 40 m long and 20 m broad on a religious day. If the average displacement of water by a man is 4 m, then the rise in the water level in the tank will be

A sum of money was invested at a certain rate of simple interest for 3 years. If the rate had been 3% higher, the amount received would be Rs. 390 more. Find the sum invested.

A man sold an item for Rs. 6750 at a loss of 25%. What will be the selling price of the same item if he sells it at a profit of 20%?

What will come in place of the question mark (?) in the following number series?

3 11 35 107 ?

What will come in place of the question mark (?) in the following number series?

2 8 ? 32 50

The ratio of milk to water in a mixture of 189 litres is 7 : 2. To make a new mixture containing milk and water in the ratio 3 : 2, the amount of water to be added is