Data Sufficiency

Hi guys,

need help with these problems:

A). Each employee in a task force is either a manager or a director. What percentage of the task force are directors?
1). The avg. salary of managers on task force is 5000$ less than avg. salary of all employees on task force.
2). The avg. salary of directors on task force is 15000$ more than avg. salary of all employees on task force.


B). Did it take Pei more than 2 hrs to walk 10 miles?(1mile = 1.6 km approx).
1). Pei walked at an avg. speed of less than 6.4 kmph.
2). On avg., it took Pei more than 9 min per kilometer to walk this distance.


C). Is m+z>0?
1). m-3z>0.
2). 4z-m>0.


D). A manufacture conducted a survey to determine how many people buy products P and Q. What fraction of the people said that they bought neither P nor Q?
1). 1/3 of the people surveyed said they bought P but not Q.
2). 1/2 of the people surveyed said they bought Q.


E). If x,y and z are integers greater than 1, what is the value of x+y+z?
1). xyz = 70
2). x/yz = 7/10

B). Did it take Pei more than 2 hrs to walk 10 miles?(1mile = 1.6 km approx).
1). Pei walked at an avg. speed of less than 6.4 kmph.
2). On avg., it took Pei more than 9 min per kilometer to walk this distance.

1 at 6.4kmph it requires 10*1.6/6.4 = 2.5 so time is going to be more than 2.5 hrs and so A is suff

2. 9 min pkm req 10*1.6*9/60 = .8*3 = 2.4 hrs so time req is more than 2.4 and so B is suff

ANs D