Find the *_correct sentence(s):-_*
a.) An improved version of the valves used in Hong Kong were sent to the Karolinska Institute in Sweden last year, Dr Baruah says.
b.) The durability of this batch of 90 "third-generation" valves, as Baruah calls them, has been
improved enormously .
3\. Pawan and Qureshi working together can do a piece of work in 10 days whereas Qureshi and Rohit
working together can do the same work in 12 days. All three work together to do a job for which they
are paid Rs. 300. If Qureshi's share is Rs. 140, then what is Pawan's share?