How can I measure the correct radial distance from One town to another 100% exact? not googleearth etc pls!?

I would like to measure the exact distance from Kochi City in Kerala state ,India to Muvattupuzha town 40kms by road north east of the city.
Google Earth is showing a wrong info with just the maps been traced .also this Muvattupuzha town is not yet scanned by google.