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Question : 20 of 40

Marks: +1, -0

A rectangular tank is 80 m long and 25m broad. Water flows into it through a pipe whose cross-section is 25

\mathrm{cm}^2

, at the rate of 16 km/hr. How much will the level of water rise in the tank in 45 minutes?

3 cm
3.375 cm
4 cm
5 cm

Solution: 👈: Video Solution

16 km/hr = 16 ×

\frac{5}{8}

= 10 m/s

In 45 minutes length of water column = 10 × 45 × 60

Hence, 80 × 25 × h =

\frac{25}{100 \times 100}

× 10 × 45 × 60

∴ h =

\frac{45 \times 3}{2 \times 80 \times 25}

m =

\frac{27}{2 \times 80 \times 5}

× 100 cm

=

\frac{27}{5}

cm = 3.375 cm

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