Sam, the mailman of Think Road, always maintains the same speed when distributing newspapers door-to-door to residents. The distance between each two adjacent houses is equal, and he spends $$30$$ minutes riding from the first house to the sixth house. The width of the house is negligible. How many minutes will he need to deliver the newspapers for all ten houses? (Ignore the time spent when Sam stops cycling and puts the newspaper in the mailbox.) 
Overseas Competition->Knowledge Point->Word Problem Modules->Interval Problems->Straight Line Type with Objects on Both Sides