There are two pumps to fill a tank with water.First pump can fill the empty tank in 8 hours, while the second in 10 hours. If both the pumps are opened at the same time and kept open for 4 hours, the part of tank that will be filled up is:

There are two pumps to fill a tank with water.First pump can fill the empty tank in 8 hours, while the second in 10 hours. If both the pumps are opened at the same time and kept open for 4 hours, the part of tank that will be filled up is:
1). $\frac{9}{10}$
2). $\frac{1}{10}$
3). $\frac{2}{5}$
4). $\frac{1}{5}$

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