um.. i still dont get it... can u elaborate a bit more. By the way the ans in the ms is 2 days 13 hours
sorry im on a real hurry doin french maths together !! im sorry if u see again the working is right .. so wat didnt u understand ??
When the pool is emptied, the water flows through a cylindrical pipe of radius 12.5 cm.
so the volume of pool is emptied i.e
volume of pool = 1512 m3 * 100 *100 *100
=1512000000 cm3
The water flows along this pipe at a rate of 14 centimetres per second.
so the area of pipe is pi * 12.5
2 =490.874 cm2
flows at 14cm/s so volume per second = 490.874 cm2 * 14cm/s
= 6870 cm3
Calculate the time taken to empty the pool.
Give your answer in days and hours, correct to the nearest hour.
volume emptying
---------------
rate of vol emptying
=1512000000 cm3
-----------------
6870 cm3/sec
=ans / 60(min) * 60(hrs) *24
=2.5473 days
=2 days 13 hrs