As you see this is the mold which causes severe health problems infact one of the most dangerous mold is that Toxic black mold which cause respiratory, nasuea and other problems like skin etc. Also it causes cancer as well.
40 kilometers is equivalent to 24.85485 miles. The conversion formula for 40 km to miles is: 40 km*1 mi. 1.609344 km=24.85484769 mi.
1 mile = 1609.344m is the absolute exact answer (since an inch, since 1959, has been defined as exactly 2.54cm). But in general 1600m should be good enough! The quick ratio to remember is 5 miles = 8 km. That makes 10 miles 16 km, so 1 mile is 1.6 km, or 1600 metres. Accurate enough for most things.