3 pipes can fill a reservoirin 10,15 and 20 hrs. resp. The first was opened at 5 a.m. , the second at 6 a.m., third at 7 a.m. When will the reservoir the filled?

3 pipes can fill a reservoirin 10,15 and 20 hrs. resp. The first was opened at 5 a.m. , the second at 6 a.m., third at 7 a.m. When will the reservoir the filled?

A. 5:20a.m

B. 6:30 a.m.

C. 10:20 a.m.

D. 4 p.m.

Correct Answer :
10:20 a.m.

Explanation : Click Here