The earth dug out of well , diameter of well is 2m and height is 20m . If the embankment is 2m wide .then find its length.also find cost of digging at rate of Rs 25 per m^3.
Answers
Answer:
Step-by-step explanation:
Well(cylinder) Embankment(ring)
d = 2m w = 2m
r = 1m h2 = ?
h1 = 20m r = 1m
R = (1+4) m
= 5m
Since,
Volume of = Volume of the earth
embankment dugout
π×(R^2-r^2)×h2 = π×r^2×h1
[(5) ^2-(1) ^2]×h2= 1×1×20
(25-1) ×h2 = 20
24×h2 = 20
h2 = 20/24
h2 = 5/6m
Therefore,
The length of the embankment = 5/6 The cost digging @ of ₹25 = π×r^2×h1×25
= 3.14×1×1×20×25
= 3.14×20×25
= 3.14×500
= 1570.00
Cost of digging = ₹1570
Hope it's helpful,