To find the cost of constructing the two cross paths in the rectangular garden, we first need to determine the area of these paths.

Dimensions of the Garden:

• Length = 60 metres
• Width = 40 metres

Dimensions of the Paths:

Each path is 4 metres wide and they are constructed parallel to the sides of the garden, passing through the center.

Area of the Paths:

1. Vertical Path:
   • Width = 4 metres
   • Length = 40 metres (entire width of the garden)

   $Area of Vertical Path=Width\times Length=4\times 40=160 square metres\backslash text\{Area\; of\; Vertical\; Path\}\; =\; \backslash text\{Width\}\; \backslash times\; \backslash text\{Length\}\; =\; 4\; \backslash times\; 40\; =\; 160\; \backslash text\{\; square\; metres\}$Area of Vertical Path=Width×Length=4×40=160 square metres

2. Horizontal Path:
   • Width = 4 metres
   • Length = 60 metres (entire length of the garden)

   $Area of Horizontal Path=Width\times Length=4\times 60=240 square metres\backslash text\{Area\; of\; Horizontal\; Path\}\; =\; \backslash text\{Width\}\; \backslash times\; \backslash text\{Length\}\; =\; 4\; \backslash times\; 60\; =\; 240\; \backslash text\{\; square\; metres\}$Area of Horizontal Path=Width×Length=4×60=240 square metres

Total Area of the Paths:

Since the paths overlap in the center, we need to subtract the area of the overlapping section (which is a square of side 4 metres):

$Area of Overlap=4\times 4=16 square metres\backslash text\{Area\; of\; Overlap\}\; =\; 4\; \backslash times\; 4\; =\; 16\; \backslash text\{\; square\; metres\}$Area of Overlap=4×4=16 square metres

Total Area of Paths:

$Total Area=Area of Vertical Path+Area of Horizontal Path-Area of Overlap\backslash text\{Total\; Area\}\; =\; \backslash text\{Area\; of\; Vertical\; Path\}\; +\; \backslash text\{Area\; of\; Horizontal\; Path\}\; –\; \backslash text\{Area\; of\; Overlap\}$Total Area=Area of Vertical Path+Area of Horizontal Path−Area of Overlap $Total Area=160+240-16=384 square metres\backslash text\{Total\; Area\}\; =\; 160\; +\; 240\; –\; 16\; =\; 384\; \backslash text\{\; square\; metres\}$Total Area=160+240−16=384 square metres

Cost of Construction:

Given the cost per square metre is ₹70:

$Total Cost=Total Area\times Cost per square metre=384\times 70=₹26,880\backslash text\{Total\; Cost\}\; =\; \backslash text\{Total\; Area\}\; \backslash times\; \backslash text\{Cost\; per\; square\; metre\}\; =\; 384\; \backslash times\; 70\; =\; ₹26,880$Total Cost=Total Area×Cost per square metre=384×70=₹26,880

Conclusion:

The cost of constructing the two paths is ₹26,880.