Data Sufficiency

1) Each Employee on a certain task force is either a Manager or a Director. What % on the task force are Directors ?

i) The avg salary of the managers on the task force is 5000$ less than the avg salary of all the employees on the task force.

ii) The avg salary of the directors on the task force is 15000$ more than the avg salary of all the employees on the task force.

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2) A construction company was paid a total of $500,000 for a project. The companys only costs for the project was for labor & materials. Was the company's profit greater than $150,000 ?

i) The companys total cost was 3 times the cost of the material.
ii) The companys profit was greater than its cost for labor.

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3) X , Y and Z shared a 1500 mile drive. Which of the 3 drove the greatest distance on the trip ?

i) X drove 1 hour longer than Y but at an avg rate of 5 miles per hour less than Y.
ii) Z drove for 9 hours at an avg rate of 50 miles per hour.

Note: How can we quickly calculate the details in option i) above, is what I am looking for.