Flow through Pipes in Series

Q. A 30 cm diameter pipe conveys water in turbulent flow regime. The friction factor has been estimated as 0.02 for this flow. If the centre line velocity is measured as 3.57 m/s, what is the discharge in the pipe ?

1. $0.212m^3/s$
2. $2.12m^3/s$
3. $0.212c{m}^3/s$
4. None of these

Q. A 225 m long , 300 mm diameter concrete pipe and 400 m long, 500 mm diameter concrete pipe are connected in series. The diameter of 625 m long equivalent pipe is :

1. 280 mm
2. 320 mm
3. 360 mm
4. 410 mm