Guys please solve this!
Answers
Correct question :
Water in a canal 30 decimeter wide and 12 decimeter deep is flowing with a velocity of 20 km per hour how much area will it irrigate in 30 minutes if 9 cm of standing water is desired ?
Solution :
Given dimensions of cuboidal canal :
Length = ?
Breadth = 30 decimeter or 30/10 = 3 m
Depth = 12 decimeter or 12/10 = 1.2 m
Also , velocity of water per hour = 20 km or 20,000m
Time given = 30 minutes
We know that velocity = speed and ,
Distance = speed × time
Speed = Distance / time
Velocity = Distance / time
= 20,000 = Distance flown in 30 minutes / (30/60)
= 20,000 × 30/60 = Length of canal
= 10,000 = Length of canal
Volume of water canal = Length × Breadth × Height
= 10,000 × 3 × 1.2
= 36,000 m³
Area × 9 cm = Volume of Canal
A × 9/100 = 36,000
A = 36,000/9 × 100
Area = 400,000 m²