Question

"Question 9 A river 3 m deep and 40 m wide is flowing at the rate of 2 km per hour. How much water will fall into the sea in a minute?

Class 9 - Math - Surface Areas and Volumes Page 228"

Answer 1

VOLUME:

The space occupied by an object solid body is called the volume of the particular object solid body volume is always measured in cubic unit.

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Given:

Depth of river (h) = 3 m
Width of river (b) = 40 m

Rate of flow of water (l) = 2 km

= 2000 m

[1 km= 1000 m]

Since,The water flows at the rate of 2 km/h, i.e the water of length 2 km flows into the sea in one hour.

Volume of water flowing into the sea in one hour = lbh

= (2000× 40 × 3)
= 240000 m³

Hence, volume of water flowing into the sea in one minute= 240000/60= 4000 m³

[1 hour= 60 min]

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Hope this will help you...