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A₁/A₂ = B₁/B₂
Maka :
(2 ¹/₂ jam) / (¹/₂ jam) = (2 ²/₃ meter ) / ( ditanya )
ditanya = ( 2 ²/₃ ) x ¹/₂ : (2 ¹/₂)
ditanya = 8/3 x 1/2 x 2/5
ditanya = 4/3 x 2/5
ditanya = 8/15
Maka, sumur akan tergali 8/15 meter.
2 2/3 = 8/3
5/2 -> 8/3
1/2 -> x
5/2x = 8/6
x = 8/6 per 5/1 × 2
x = 8/6 × 1/5 × 2
x = 16/30