Quantitative Aptitude - Arithmetic Ability Questions

A man goes to a place on bicycle at speed of 16 km/hr and comes back at lower speed . If the average speed is 6.4 km/hr in total , then the return speed (in km/hr) is

A 800 metres long train is running at the speed of 90 km/hr. If it crosses a bridge in 50 seconds, then what is the length (in metres) of the bridge?

The average weight of P, Q and R is 47 kg. If the average weight of P and Q be 32.5 kg and that of Q and R be 48.5 kg, then what is the weight of Q (in kgs)?

How long will Ramesh take to run round a square park of edge 50 meters, if he runs at the rate of 18 km/hr?

A can do a piece of work in 10 days, B can do it in 12 days and C can do it in 15 days. In how many days will A, B and C finish it, working all together?

The largest 5 digit number exactly divisible by 84 is:

The diagonal of a cube is 192 cm. Its volume in cm3 will be 

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