Wipro Company Numerical Ability Time and Work

Three taps are connected to a water tank. First and second taps till it up in 'x' minutes and 'y' minutes respectively, when they arc opened separately. The third tap empties the full tank in 'z' minutes. If all are opened simultaneously, what is the condition required on 'x', 'y' and Y to ensure that the tank will actually fill up?

a. x + y > z
b. (X + Y)/z > Z
c. z(x+y) > z
d. yz + zx > zy

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Wipro Other Question
A sales executive's monthly salary has two components: a percentage commission on the achieved sales and a fixed amount. For the first 3 years, the percentage commissions were 30%, 20%, and 10% respectively and his fixed salary was 1000, 2000 and 3000. It was seen that the total yearly salary he received for the first 3 years was exactly thesame for each year. Now, what can be said about his annual sales?

a. His annual sales+has been growing.
b. His annual sales has been falling.
c. His annual sales cannot have gone up in the second ear and then gone down in the third.
d. His annual sales went up in the second year and again come down in the third year. A racing car moving at 250 km/hr has to halt for a tyre change when it leads over the 2nd position by 580 metres. By the end of the tyre change which takes 14 seconds, the car that was in the 2nd position is now ahead by 260 metres. What is the speed of this car?

a. 166 km/hr
b. 200 km/hr
c. 216 km/hr
d. 266 kni/hr