Distance-and-Time
Question 1 |
Four pipes can fill a reservoir in 15, 20, 30 and 60 hours respectively. The first one was opened at 6 AM, second at 7 AM, third at 8 AM and the fourth at 9 AM. When will the reservoir be filled ?
11 AM | |
12 Noon | |
1 PM | |
1:30 PM |
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