Question

a water pipe can fill a 300 litre tank in 1 hour 40 minutes in how much time will it will 3 by 10 of the tank

Answer 1

It is in Inverse proportion.
First we will convert hour into minutes.
1 hour 40 minutes=60+40
=100 minutes (because
1 hour =60 minutes)
3/10 of 300 = 90 litres
$x1y1 = x2y2 \: for \: inverse \: proportion$
x1 =300 litres , x2=90 litres
y1=100 minutes, y2=y
By formula,
300×100=90y
y=(300×100)/90
y =333.33 minutes.