B does a work in 4 hours 30 minutes Another man A does the same work in 3 hours 10 minutes. Who is faster and by how much?

B does a work in 4 hours 30 minutes Another man A does the same work i

1.	B does a work in 4 hours 30 minutes Another man A does the same work in 3 hours 10 minutes. Who is faster and by how much?
A.	A by 1 hour 20 minutes.
B.	A by 1 hour 30 minutes.
C.	A by 1 hour 35 minutes.
D.	All the above
E.	None of these
Answer» B. A by 1 hour 30 minutes.