regarding Eway bill

If your Consignment Value exceeds ₹50,000, then you have to generate E-way Bill.

No Kilometer Clause.

However, E-way Bill is not required upto 20KM when the Conveyance is going to a Weighbridge for weightment purpose.

If consignment value exceed 50k, & being supplied by motorised conveyance , Eway is mandatory

The value to generate Eway bill in every state is varied. kindly confirm from your local office

If a vehicle carries goods against multiple Invoices, then where the aggregate Invoice value* exceed Rs. 50,000 * and move by Motorised conveyance.
So, if either of above points is satisfied, the user should generate e-Way Bill.

Note: states of west Bengal, Delhi, Tamil nadu & Maharashtra had double the threshold for electronic-way (e-way) bill for intra-state movement of goods to Rs 1 lakh. 
Rest of the other states the threshold limit is 50k

There is no Distance Relaxation In eway bill , it was earlier that upto 10 km u can send your material to Transporter place by Generating A part for further delivery but it increased to 50 km by noti.12/2018.