Quantitative Aptitude - Arithmetic Ability Questions

A gun is fired at a distance of 1.7 km from Ram and he hears the sound after 25 seconds. The speed of sound in meter per second is

10 people can build a wall in 12 days. Six people, each only half as efficient as those in the first group, will be able to complete 3/5 of such a wall in

3 numbers whose average is 112, the first number is 1/6th the sum of other 2. What is the first number?

The reciprocal of the sum of the reciprocals of 2/9 and 7/10 is

If {12(a-b)}2+ab=p(a+b)2, then the value of p is 

Robin can do a work in 10 hours. Pradeep and Robin together can do the same work in 4 hours. Pradeep and Nitin together can do the samework in 5 hours. In how many hours Nitin alone can complete the same work?

Raghuram sells a machine for Rs 43 lakhs at a loss. Had he sold it for Rs 53 lakh, his gain would have been 7 times the former loss. Find the cost price of the machine.

When a number is increased by 18, it becomes 106% of itself. What is the number?