Quantitative Aptitude - Arithmetic Ability Questions

A car travels a certain distance at 32 km/h and comes back at 68 km/h. What is the average speed for total journey?

Three pipe P, Q and R can fill a tank in 12 minutes, 18 minutesand 24 minutes respectively. The pipe R is closed 12 minutesbefore the tank is filled. In what time the tank is full?

For what sum will the simple interest at R% for 2 years will be R?

The length of diagonal of a square is 9√2 cm. The square is reshaped to form a triangle. What is the area (in sq.cm) of largest in circle that can be formed in that triangle?

The total surface area of a hemisphere is 4158 cm2. Find its diameter (in cm).

The least number to be added to 13851 to get a number which is divisible by 87 is

9 hrs after a goods train passed a station, another train travelling at a speed of 72 km/hr following that goods train passed through that station. If after passing the station the train overtakes the goods train in 3 hours. What is the speed of the goods train?

If the ratio of cost price and selling price be 10:11, then the profit percentage is