I think you may have this the wrong way around.
If you really want to know how many miles in a meter, the answer is 1 meter = 0.000621371192 miles.
Or if you do have it the wrong way around the answer is, there are 1,609.3 meters in a mile.
1 mile = 1609.344 meter
1 meter = 0.00062 mi
1 mile = 1 609.344 meters
One meter equates to about 0.00062137 miles.
100 centimetre equals one meter.
One meter per second is equal to: 2.237 miles per hour.
One meter = 1,000 millimeters.
One meter = about 0.000621 miles.
1 meter = 10 decimeters
1 meter = 100 centimeters
1 meter = 100 centimeters
100
1000 mm equals one meter
There are 0.00062 miles, approx.
Start by considering that a decimeter is one tenth of a meter. That's 1/10th of a meter. Not very much. How many miles are in a tenth of a meter. Only a small fraction. It turns out that 0.1 meters equals about 6.2137 × 10-5 miles, or 0.000062137 miles. Your 350 decimeters is 0.0217479917 miles. There are about 1609.344 metres in a mile, so you'll make your calculation from there.