In a swimming pool measuring 80 m × 60 m, 120 men take a dip. If the average displacement of water by a man is 6 m³, then the rise in water level is –

0.15 m

h = height of water level which is raised by 120 men.

Volume of water displaced = Displacement of water done by 120 men

80 × 60 × h = 120 × 6

4800 × h = 720

$h=\frac{720}{4800}=0.15 m$