A completes $$ {7 over 10}$$ of work in 15 days, then he completes the remaining work with the help of B in 4 days. The time required for A and B together to complete the entire work is

A completes $$ {7 over 10}$$ of work in 15 days, then he completes the

1.	A completes $$ {7 over 10}$$ of work in 15 days, then he completes the remaining work with the help of B in 4 days. The time required for A and B together to complete the entire work is
A.	$$ {10} {2 over 3} days$$
B.	$$ {12} {2 over 3} days $$
C.	$$ {13} {1 over 3} days $$
D.	$$ {8} {1 over 4} days $$
Answer» D. $$ {8} {1 over 4} days $$

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A completes $$ {7 over 10}$$ of work in 15 days, then he completes the remaining work with the help of B in 4 days. The time required for A and B together to complete the entire work is

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