Pipe A and B can fill the tank in 10 hrs and 15 hrs respectively. Both can fill the tank together in ____hrs.

Pipe A and B can fill the tank in 10 hrs and 15 hrs respectively. Both

1.	Pipe A and B can fill the tank in 10 hrs and 15 hrs respectively. Both can fill the tank together in ____hrs.
A.	6 ∶ 15
B.	6
C.	6 ∶ 10
D.	4
Answer» C. 6 ∶ 10

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Pipe A and B can fill the tank in 10 hrs and 15 hrs respectively. Both can fill the tank together in ____hrs.

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