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 km = 24.8548 mi. There are 1.609344 kilometres in a mile. Therefore, rounded to two decimal places, 40 kilometres is equal to 40/1.609344 = 24.85 miles.
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.