Ok, so here's what we have got.
✨ For the pipe
✨For the cuboid [tank]
h=3m [because we only need the volume till the height of 3 meters]
Now, the volume of the cuboid [tank] is lbh= 150*100*3 meters
then now we know that speed=distance/time, where we have been given the speed. [please don't notice my grammar mistakes]
here, speed of water is 15 km/h and we are given the integers in meter, so we are going to convert the speed into the meter/second first.
and the speed is......
=4.167 meters per second.
Now, the water flows on 4.167 meters per second. and the volume of the tank is 45000 m³. Now, we have got the speed and the volume. It was all okay till here. But from here, it the question made me think.
[I'm not sure if I'm right or wrong from ahead though I'll try]
so, to find the time, we might divide the area by the speed. [speed=distance/time, but here what we have got is the area, that's why I'm confused]
so, using the area in spite of the distance, here's what we have got...
[I'm going to ask this question to my maths teacher today evening to make sure if I'm right or now, till that time, this was my try.]
hope it helped.
Y'know it was an INSANE! question for me. Really, you've got a nice question. ^_^