Mahesh and Umesh can complete a work in 10 days and 15 days respectively. Umesh starts the work and after 5 days Mahesh also joins him in all the work would be completed in
A. 7 days
B. 9days
C. 11 days
D. None of these
Answer:B
Mahesh and Umesh can complete a work in 10 days and 15 days respectively. Umesh starts the work and after 5 days Mahesh also joins him in all the work would be completed in
A. 7 days B. 9days C. 11 days D. None of these