TCS Company Numerical Ability Time and Work

. George takes 30 days to do a piece of work and Mark takes 45 days for the same work. For the first 15 days only George works. Then Mark also joins him. Find the time taken to complete the entire work.

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TCS Other Question

Read the following statements and answer the questions that follow?
a) Seeta, Rajinder and Surinder are children of Mr. and Mrs. Maudgil
b) Renu,Raja and Sunil are children of Mr. and Mrs. Bhaskar
c) Sunil and Seeta are married and Ashok and Sanjay are their children
d) Geeta and Rakesh are children of Mr. and Mrs. Jain
e) Geeta is married to Surinder and has three children named Rita, Sonu
and Raju.

How is Rajinder related to Raju?
a) brother
b) uncle
c) brother in law
d) cousin
e) maternal uncle
M is 30% of Q. Q is 20% of P. N is 50% of P. Find M:N ratio