state gov WBPSC Clerkship Mock Test 2023 - 24 Quantitative Aptitude Time and Work

If 5 pumps work for ৪ hours a day, a reservoir becomes empty in 30 days. If 4 pumps work for 6 hours a day, then in how many days can the reservoir be vacant?

1
20
2
40
3
50
4
30
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