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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:
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- 9/10
- 1/10
- 2/5
- 1/5
- 9/10
Correct Option: A
As per the given in question , we have
| Part of the tank filled in an hour by both pumps = | + | = | = | ||||
| 8 | 10 | 40 | 40 |
| ∴ Part of the tank filled in 4 hours = | = | ||
| 40 | 10 |
