Question

Milk is pouring into a reservoir at the rate of 90 litres per minute. If the volume of reservoir is 108 m${}^3$. Find the number of minutes it will take to fill the reservoir.

• A. 1600 minutes
• B. 1200 minutes
• C. 1400 minutes
• D. 2000 minutes

Answer 1

The correct option is B 1200 minutes

Given
volume of reservoir
= $108{\text{m}}^3=108\times 1000\text{litres}$
($\because 1{\text{m}}^3=1000\text{litres})$
The reservoir is filling at the rate of 90 litres per minute.
$\therefore$ Time taken to fill the reservoir
= $\frac{108\times 1000}{90}\text{minutes}$
= 1200 minutes