Person ‘A’ can complete a work in 10 hours and ‘B’ can complete it in 5 hours. Both started working together but ‘A’ left after working for one hour and ‘B’ finished all the remaining work alone. In how much time the entire work was completed by ‘B’?
A. 4 hours
B. 3.5 hours
C. 4.5 hours
D. 3.75 hours
Answer:B
Person ‘A’ can complete a work in 10 hours and ‘B’ can complete it in 5 hours. Both started working together but ‘A’ left after working for one hour and ‘B’ finished all the remaining work alone. In how much time the entire work was completed by ‘B’?
A. 4 hours B. 3.5 hours C. 4.5 hours D. 3.75 hours