Apedia Logo Apedia
Join

Choose Language

Select your preferred reading language
🇬🇧
English
✔
🇮🇳
हिन्दी
✔
✕
Full View
Mensuration
Volume and Surface Area
EN हिंदी
✕
NTPC Graduate Tier 1 2025 Shift-3 📅 06 Jun, 2025

A river 20 m deep and 36 m wide is flowing at the rate of 2.7 km/hr. The amount of water (in m³) that runs into the sea per minute is:

A
30,024
B
32,400
C
30,240
D
34,200
Result Summary
Logo

APEDIA

NTPC Graduate Tier 1
2025 • 06 Jun, 2025 • Shift-3
A river 20 m deep and 36 m wide is flowing at the rate of 2.7 km/hr. The amount of water (in m³) that runs into the sea per minute is:
Correct Answer
32,400
Understanding the Dimensions: The cross-sectional area of the river is given by Depth $\times$ Width, which is $20 \text{ m} \times 36 \text{ m} = 720 \text{ m}......
Ref/Book : NTPC Graduate Tier 1 2025
Ref. Subject Mensuration
Chapter -
Ref. Topic Volume and Surface Area
Pg. No -
💡 Analysis & Explanation
Understanding the Dimensions ▼
The cross-sectional area of the river is given by Depth $\times$ Width, which is $20 \text{ m} \times 36 \text{ m} = 720 \text{ m}^2$.
Converting Speed to Useful Units ▼
The speed of the river is $2.7 \text{ km/hr}$. We need to convert this to meters per minute. $2.7 \text{ km/hr} = 2700 \text{ m} / 60 \text{ minutes} = 45 \text{ m/minute}$. This means a 45-meter long 'block' of water flows into the sea every minute.
Calculating Volume ▼
The volume of water flowing per minute is the cross-sectional area multiplied by the flow speed in meters per minute. Volume = $720 \text{ m}^2 \times 45 \text{ m/minute} = 32400 \text{ m}^3\text{/minute}$.
Conclusion ▼
The amount of water running into the sea per minute is 32,400 m³.
← Prev
29 / 100
Next →