Solution:
Area of the valley
Rainfall in the river valley
Now, find the volume of water.
Volume of water
Now, find the volume of water of one river.
Volume of water of one river
So, volume of water of 3 rivers
Thus, .
3 3
9 7728 236000000m 00000m
Question: 5
An oil funnel made of tin sheet consists of a 10 cm
long cylindrical portion attached to a frustum of a
cone. If the total height is 22 cm, diameter of the
cylindrical portion is 8 cm and the diameter of the
top of the funnel is 18 cm, find the area of the tin
sheet required to make the funnel.