A train with 72 km/h speed crosses a stationary pole in 35 seconds. How much time (in minutes) does it take to cross a 1.1 km long bridge?

Given train speed = 72 $$\frac{km}{hr}$$

The length of the train will be calculated from the formula Speed = $$\frac{Distance}{Time}$$ i.e.  72$$\times$$ $$\frac{5}{18}$$ $$\times$$35 = 700 m or 0.7 km

Hence, for crossing a bridge of 1.1 km , it will cover a total distance of 1.1 km + 0.7 km = 1.8 km 

So, from formula we get Time taken by train (in minutes) to cross a bridge = $$\frac{1.8}{72}$$ $$\times$$60

= 1.5 minutes.