# A Rectangular Tank 15m Long and 11m Broad is Required to Receive Entire Liquid Contents from a Full Cylindrical Tank of Internal Diameter 21m and Length 5m. Find Least Height of - Mathematics

A rectangular tank 15m long and 11m broad is required to receive entire liquid contents from a full cylindrical tank of internal diameter 21m and length 5m. Find least height of tank that will serve purpose .

#### Solution

Given length of rectangular tank = 15m

Breath of rectangular tank = 11m

Let height of rectangular tank be h

Volumeof rec tan gular tan k = lbh

Volume = 15 x 11 x h     ____(1)

Given radius of cylindrical tank (r) =21/2m

Length/height of tank = 5m

Volume of cylindrical tan k = πr2h

=pi(21/2)^2xx5      _______(2)

Since volumes are equal

Equating (1) and (2)

15xx11xxh=pi(21/2)^2xx5

⇒ h=(22/7xx(21/2)^2xx5)/(15xx11)

⇒ h = 10.5m

∴ Height of tank = 10.5m

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#### APPEARS IN

RD Sharma Class 10 Maths
Chapter 14 Surface Areas and Volumes
Exercise 14.1 | Q 38 | Page 30