Discussion about math, puzzles, games and fun.   Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ • π ƒ -¹ ² ³ °

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## Topic review (newest first)

mathsyperson
2005-04-21 04:49:29

Total excavated earth: Pi*5.5m squared*7km=665500 cubic metres (Taking Pi as 22/7)
Length of road covered: 665500/(0.5m*11m)=121km.

austin81
2005-04-15 23:29:39

thanks for that quotation and more espcially for the help

MathsIsFun
2005-04-05 07:50:39

These are nice problems ...

I think this one can be solved by just working out the volumes. Figure the volume of the cylinder, then divide it by (0.5 x 11).

austin81
2005-04-05 01:35:06

A cylindrical tunnel 5.5m in diameter is driven through  a mountain for a distance   of 7km. the ezcavated earth i s spread to a depth of  50cm on the surface of a  road 11m wide. Calculate the number of ilometers of the road that can  be covered with all of the excavated earth. (Take pi as 22/7)