b) (y – x) hours
c) $$\left( {\frac{{xy}}{{x – y}}} \right)\,{\text{hours}}$$
d) $$\left( {\frac{{xy}}{{y – x}}} \right){\text{hours}}$$
Answer: d
Explanation:
Time will be taken by both of them to fill the tank
$${\text{ = }}\frac{{xy}}{{y – x}}$$
A pipe can fill a tank in x hours and another can empty it in y hours. In how many hours they together fill it in ( y > x) ?
a) (x – y) hours
b) (y – x) hours
c) $$\left( {\frac{{xy}}{{x – y}}} \right)\,{\text{hours}}$$
d) $$\left( {\frac{{xy}}{{y – x}}} \right){\text{hours}}$$
Answer: d
Explanation:
Time will be taken by both of them to fill the tank
$${\text{ = }}\frac{{xy}}{{y – x}}$$
b) (y – x) hours
c) $$\left( {\frac{{xy}}{{x – y}}} \right)\,{\text{hours}}$$
d) $$\left( {\frac{{xy}}{{y – x}}} \right){\text{hours}}$$
Answer: d
Explanation:
Time will be taken by both of them to fill the tank
$${\text{ = }}\frac{{xy}}{{y – x}}$$
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