 # RS Aggarwal Solutions Class 9 Mathematics Solutions for Volume And Surface Area Of Solids Exercise 15B in Chapter 15 - Volume And Surface Area Of Solids

Question 30 Volume And Surface Area Of Solids Exercise 15B

A cylindrical water tank of diameter 1.4m and height 2.1m is being fed by a pipe of diameter 3.5cm through which water flows at the rate of 2m per second. In how much time will the tank be filled?

Consider the tank to be filled in x minutes

We know that

The volume of water that flows through the pipe in x minutes = Volume of tank

By substituting the values

Π × (3.5/ (2 × 100)) 2 × (2 × 60x) = Π × (0.7)2 × 2.1

On further calculation

0.115395x = 3.23106

So we get

x = 28

Therefore, the tank will be filled in 28 minutes.

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