Quantitative Aptitude - Arithmetic Ability Questions

If a boat goes upstream at a speed of 21 km/h and comes back the same distance at 28 km/h. What is the average speed (in km/hr) for the total journey?

(242699 + 167109) ÷ (9946 –9446) = ?

A train has to cover a distance of 900 km in 25 hours. What should be its average speed in meters/second?

If x+1/x = 2, then the value of x7+2/x6 is equal to?

If cosec θ + sinθ = 5/2 then the value of cosecθ - sinθ is

A Number is increased by 20%. To get back to the orignal number, the increased number is to be reduced by

The length and breadth of a rectangle are 24 cm and 7 cm respectively. What must be the length of its diagonal (in cm)?

A can do a piece of work in 18 days. He worked at it for 12 days and B finished the remaining work in 8 days. B alone can do the whole work in