Express the following scale as a ratio in the form $1:\editable{}$1:.

1 cm represents $240$240 cm.

$1:\editable{}$1:

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Express the following scale as a ratio in the form $1:x$1:x.

1 cm represents $2$2 km.

A map has been drawn to a scale of $1:7000$1:7000. Find, in metres, the actual distance between two points if the map distance between the points is $8$8 mm.

On a house plan that has been drawn to a scale of $1:100$1:100, the building is drawn to a length of $158$158 mm. What is the actual length of the building?