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2. What is the ratio of the total no. of students in institute R to that in V?
4. If the no. of students in institutes P, Q and R with IT specialisation increased by 15%, 22% and 10% respectively from 2012 to 2013, what was the total no. of students with IT specialisation in the three institutes together in 2013?
7. A train moving at the speed of 72 kmh–1 crosses a bridge in 20 seconds. Another train 40 metres shorter moving at the speed of 18 kmh–1 crosses the same bridge. Find the time taken by the second train to cross the bridge.