A mason can build a tank in 12 h. After working for 6 h, he took the help of a boy and finished the work in another 5 h. The time that the boys will take alone to complete the work is

A mason can build a tank in 12 h. After working for 6 h, he took the h

1.	A mason can build a tank in 12 h. After working for 6 h, he took the help of a boy and finished the work in another 5 h. The time that the boys will take alone to complete the work is
A.	30 h
B.	45 h
C.	60 h
D.	64 h
Answer» D. 64 h

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A mason can build a tank in 12 h. After working for 6 h, he took the help of a boy and finished the work in another 5 h. The time that the boys will take alone to complete the work is

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