in my opinion,trekking takes more distance,time and intensity than hiking

They are both walking sports. Trekking lasts more than one day generally sleeping in a camp while hiking lasts some hours.

I agree with all of the above. Trekking is more strenuous and lasts more than a day. Hiking is easier and can mean just a walk in a nearby forest or up a small hill. "I went trekking in Nepal last year with my friends." " I'm going hiking tomorrow. Do you want to go with me?"

While I'm definitely not great outdoors-man, to my ears "to go hiking" implies a mountain (on foot) (hike up a mountain), while "to go trekking" is a more general term for outdoor adventure. I think you can even go trekking in car/vehicle of some sort! hope that helps!